You can get your copy today from the Nintendo e-Shop Here!
Here are the FAQ's from 505 Games:
Terraria 3DS Launch Day FAQ (open)Terraria 3DS Launch Day FAQ (close)
Terraria 3DS launch FAQ
What content is included?
Terraria 3DS includes all the content from 1.2 with the exception of Dyes which are excluded on technical grounds*. To make up for that, we’ve added Minecarts, Fishing and a few 1.3 UI options like the ability to quick stack to a chest. The 3DS version also features a completely overhauled interface, making full use of the two screens. You can cycle the bottom screen between an intuitive touch to build interface; a world map; or as a quick-select inventory bar. It’s the most intuitive Terraria has ever been on console, and we’ve included a few surprises for the Nintendo fanbase.
Will there be variable world sizes?
At launch, there is a single world size of 1750x900. You can save up to three Worlds and three Characters per console. This is as large as the original 3DS can handle. We are investigating the possibility of introducing larger worlds as a New 3DS-exclusive feature in future, but for launch we felt it was important to start everyone off on a level playing field.
Any other technical stuff I should be aware of?
This game plays in 2D ONLY. This is for a couple of reasons: the way the graphics layers work on 3DS was not conducive to a really exciting 3D effect; and the technical overheard required to run the game in 3D would have meant compromises in terms of world size and other gameplay-damaging areas. The game runs on ALL models of 3DS (original, XL and New) and also 2DS. The framerate on original 3DS is 30fps, whereas the New gets a boost to 60FPS.
Any other New 3DS benefits?
For launch, we wanted a single version that could be enjoyed by all players. There are...
Great news mobile Terrarians! We have successfully passed through the submission process for iOS, Google Play, and Windows Phone. You will get the update within the next 24-48 hours. Thanks for sticking with us through the wait and ENJOY! We can't wait to hear about all of your exciting mobile adventures.
Amazon users: your version is still in submission, we will let you know as soon as we have approval on it! Hoping to have some good news for you soon.
We are very pleased to announce the early arrival of Terraria on Nintendo 3DS! Starting December 10th, Terraria will be available in the 3DS eShop for $19.99 (£16.99). The newest addition to the Terraria family will feature touchscreen controls and 4-player multiplayer using Local Play. Initially it is only available digitally while physical copies are planned to launch early next year.
We just wanted to inform you that tomorrow morning around 10-11AM PST the forums will be offline for a moment while we do regular maintenance. You will more then likely not see it down for more then five minutes.
If you experience any issues after the update, then please use this post to report them in the most detailed fashion possible.