Here's what's in it:
Dragon Age Inquisition Inquisitor's Edition Includes*:

• Highly detailed exclusive Inquisitor Collector's Edition case produced by TriForce measures approximately 8.5" x 13.5" x 14.5"
• The case is individually wrapped in faux reptile skin, has the mark of the Inquisitor stamped on top in gold foil, with an interior fitted with imprinted red silk.
• Cloth map of Thedas drawn to scale measuring approximately 22" x 32"
• 72 card Major and Minor Arcana tarot card deck with custom artwork depicting mythology from Dragon Age lore.
• Inquisitor full scale, six piece, lock tool set
• One set of four full scale map markers each approximately measuring 3.5" x 3.5" x 4"
• Inquisitor's Badge
• Quill and Inkpot
• 40-page Inquisitor's Journal
• Orlesian Coins
• Limited edition Steel Book case to house your copy of the game
• Copy of Dragon Age: Inquisition
  

This edition is sold out everywhere. The only way to still get it - or parts of it - would be to search eBay, which you can do here.

Click here if you have received damaged items in your Inquisitor Edition.

Standard and Deluxe Editions

Deluxe Edition
Dragon Age Inquisition Deluxe Edition Includes:

• Skyhold Throne - Every ruler should sit in a place of high honor, but as the Inquisitor you will have the greatest of all, fashioned from an ancient dragon skull.
• Red Hart Halla - Traverse the perilous, living world atop this great-horned beast.
• Bog Unicorn - Once belonging to an evil marauder, this unique mount has returned to inspire fear into those who would oppose you.
• Bring the world of Thedas wherever you go with the digital soundtrack
• Bonus digital content - to be announced!

Where to order:

Amazon, Deluxe Edition: Xbox 360 | PS3 | PC | Xbox One | PS4
Amazon, Standard Edition: Xbox 360 | PS3 | PC | PC Download | Xbox One | PS4
US GameStop: XBox 360 Standard XBox 360 Deluxe | PS3 Standard PS3 Deluxe | PC Standard / Download PC Deluxe | XBox One Standard XBox One Deluxe | PS4 PS4 Deluxe
UK Gamestop: Choose Your Version
Italy Gamestop: All Versions
Best Buy: XBox 360 Standard XBox 360 Deluxe | PS3 Standard PS3 Deluxe | PC Standard PC Deluxe | XBox One Standard XBox One Deluxe | PS4 Standard PS4 Deluxe
Origin Store: Standard | Deluxe | Game of the Year 
Microsoft Store: Xbox 360 | Xbox 360 Deluxe | PC | PC Deluxe | Xbox One | Xbox One Deluxe
PC Download (Origin) Version is currently $48.31 at G2A for the Global edition (Origin CD Key) - keep checking back for the price as it fluctuates.

Game of the Year Edition

Includes all of the DLC! Jaws of Hakkon, The Descent, Trespasser, Deluxe Upgrade and both Spoils packs: Spoils of the Avvar & Spoils of the Qunari.

Where to order:

Origin
Amazon: PC Digital Code | PC Direct to EA Account | Xbox One Digital Code | Xbox One | PS4 

Broken / Missing Pieces in Inquisitor Edition

If you have broken/missing pieces in the Inquisitor Edition, you will get more traction if you contact the manufacturer directly. Certainly contact GameStop as well as they are ultimately responsible - your purchase was from them. However, TriForce is trying to get something together to replace broken items so you can get faster and better info from them. Here are their details:

COMMUNITY MANAGER : Joshua Grey (jgrey@projecttriforce.com)
OFFICE : 917-300-1891
Project TriForce
600 3rd Ave, New York 10016
www.projecttriforce.com
FACEBOOK : ProjectTriForce
TWITTER : @ProjectTriForce
SKYPE : TriForce_Josh

Be prepared to provide pictures of the damaged item(s), the name of your retailer and your receipt from the purchase.

*GameStop UK advertised that the Inquisitor Edition included everything from the Deluxe edition and this is apparently not the case, as the enclosed code is only for the standard edition. At this point I do not know if GameStop or Bioware will honor the mistake or not, as I've heard nothing either way about it.

System Requirements for PC:
(Source 1 and Source 2)

Check Can You Run It to automatically detect if your computer can run the game.

Recommended:
OS: Windows 7 or 8.1 64-bit
CPU: AMD six core CPU @ 3.2 GHz, Intel quad core CPU @ 3.0 GHz
System RAM: 8 GB
Graphics Card: AMD Radeon HD 7870 or R9 270, NVIDIA GeForce GTX 660
Graphics Memory: 2 GB
Hard Drive: 26 GB
DirectX 11

Minimum:
OS: Windows 7 or 8.1 64-bit
CPU: AMD quad core CPU @ 2.5 GHz, Intel quad core CPU @ 2.0 GHz
System RAM: 4 GB
Graphics CARD: AMD Radeon HD 4870, NVIDIA GeForce 8800 GT
Graphics Memory: 512 MB
Hard Drive: 26 GB
DirectX 10

* Xbox 360 controller supported
* 100% DirectX 9.0c compatible sound card
* Online Authentication at time of installation

Also:
Confirmed: #DAI resolution is 1080p on PS4, and 900p on Xbox One. We maximized the current potential of each platform.
(source)

Game Guides

Game guides from Prima! Paperpack Game Guide | Hardcover Game Guide | Uber Inquisitor Edition Game Guide - Limited Edition!

Click here for more details on the Prima Game Guides

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Previous info (keeping for historical purposes)

Pre-order bonus: Flames of the Inquisition armor and weapon set!

• Multi-class Weapons – Smite your enemies with the Flames of the Inquisition weapons arsenal. Whether staff or daggers, greatsword or war hammer, these weapons will make short work of your foes.
• Inquisitor Armor – Protect yourself against the onslaught of enemy attacks by suiting up in the Flames of the Inquisition Armor.
• Armored Mount – Flames of the Inquisition gear also includes a valiant steed, complete with its own set of Inquisition Armor forged from the flames of battle.

The Inquisitor's Collector's Edition of the game used to be available from the following before they sold out everywhere:

US Gamestop: XBox 360 | PS3 | PC | XBox One | PS4
UK Gamestop: Choose Your Version | Order PC Version