3D Client Update:
We have a specific date when the legacy 3D client will be going away (as always, all dates are subject to change.) The 3D client will no longer be usable on the live servers as of the client patch that is projected to go live on April 2nd. After that patch, the only clients that you will be able to log in with are the 2D client and, if you're a beta tester, the KR client on certain servers.
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"Will KR be able to support custom music files.. IE will they be in MP3 format??"
While KR's music files will be in MP3 format, they most likely won't be accessible for players to edit at launch. We have fond dreams of an easy-to-use custom music system, but, however cool it may be, it has to take a back seat to some other things - like getting crafting, targeting, custom houses, etc to work right. I'm sure y'all understand.
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"Is Kingdom Reborn an in-house engine? What is the engine's name?"
An interesting bit of trivia - the engine we are using for KR is Gamebryo.
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"3D games give me motion sickness. I'm worried that Kingdom Reborn will make me sick - will it?"
Kingdom Reborn has the same fixed, top-down perspective as the current clients - you can zoom in and out, but you can't rotate the camera. If the current client doesn't cause motion sickness, it is very unlikely that KR will cause it - I tend to get motion-sick myself in certain kinds of games, and KR doesn't bother me at all.