The next generation of consoles, or at least the next Xbox, WONT be coming out in 2011 or 2012. Read http://xbox360.ign.com/articles/105/1059470p1.html. Microsoft says they don't think they're halfway through this generation yet. Which makes sense, considering Natal will be extending the lifespan of the 360 for quite a bit. The Xbox 360 was released in 5 years ago, so if Microsoft thinks they aren't even halfway through this generation yet, that means we have absolutely no reason to think that TESV will be made for the next generation of consoles.
And don't worry about the PS4, Bethesda seems to make their games for Microsoft first, Sony second, so if Microsoft doesn't have another console coming out but Sony does, they're going to make it for this generation, not the next.
Also, don't use this post as an excuse to start bashing Natal please.