they are purposely being pretty tight lipped about the music. However, in addition to not wanting to share too much, they also said that the music is usually the last thing done so...
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I remember hearing that the music was done a long time ago, by Matt Uelmen who also did the music for Diablo 2. There are many pieces of it available already. Some ambient music in the background on the official site, but also 3 tracks from the Echoes of War album released in 2008 (Legacy of Terror, Children of the Worldstone, Last Angel).
I really liked the music of D2 - that guitar in Act 1 and my absolute favorite being Lut Gholein. Hopefully it is similar.
Wherever Act 4 is to take place, my hope is on some orchestral sounding stuff to reflect the titanic battle that might be taking place.
Monkalicious: http://us.battle.net/d3/en/profile/OptimusPrime-12194/hero/79139477
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Matt Uelmen is not working on Diablo 3. He did record a few things for the original Diablo 3 development way back when, but all that was pretty much scrapped when Blizzard started over. This website has a little write up of the composers for D3: http://www.originalsoundversion.com/blizzcon-2010-all-aboard-for-new-music-from-diablo-iii/