There's been a lot of discussion about this. The 990 and 970/1070 are still pretty new, so we won't see anything to replace them for at least a year (more likely two or a bit more). Those next generation processors will of course have to support the new formats, but first the formats have to really arrive - Toshiba's HD-DVD players will only decode TrueHD in stereo, and there's no sign of DTS-HD content in the near future.

Dolby Digital Plus, Dolby TrueHD, and DTS-HD are all compatible with HDMI v1.1 if the player does the decoding to multichannel PCM (an approach that allows the most complete support for interactive content). HDMI v1.3 (which has not yet been released by HDMI as a standard and is not likely to appear before fall at the earliest) will allow a digital bitstream of these formats to be passed across HDMI for decoding at the processor.