According to Computer and Video Games the next game based on the Doom 3 engine is a Quake 2 Remix.
But what I would like to see is an ET-Remix (as full priced game) - maybe an ET2
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Quake 2 Remix?!
Man that would rule. They’re doing Q2 because they don’t need to design a game, just port it into the new engine. But how many people play Quake 2 nowdays? You’re right it should be an ET Remix 
I still play quake 2…does that make me a sad person? the chances are they WILL make an ET 2. Or a sci-fi game. I think its prolly gonna be a big SP thing…mebee!
CVG got the wrong end of the stick it seems,
http://www.homelanfed.com/index.php?id=21933
http://archive.gamespy.com/gdc2004/carmack/
But hey, there was a fair bit of interest about it so you never know 
…The next game based on the DOOM III engine, which uses a far superior physics,collision detection (CDPM), and particle engine, developed by splashdamage would have a cool SP and MP with a nice Sci-fi theme
or think about cooperative SP? ofcourse you all have to wait after DOOM III has been released before screenshots are appearing on this forum errr i ment the net 
Nuff said ere.
Probs said it, remember about ET and thought hrms… :]
Cant see there being an ET2. A similar gametype in future games possibly but not a proper ET2 release… just imho.