ATI didn't talked a lot about its Radeon Xpress chipset line at CES 2006 in Las Vegas but it did state that the next-generation of this chipset will feature HDMI support.
ATI is expected to ship its RS485 and RS490 chipsets shortly, if it hasn't begun to do so already. The RS485 is said to be a tweaked version of the already-shipping RS482. Both parts incorporate a Radeon X300 graphics core, but the RS485's is clocked higher than the RS482's. The RS485 is said to be pin-compatible with the RS482, ensuring a relatively smooth upgrade path for motherboard makers.
ATI is also preparing the RD580 chipset, which will feature dual PCI Express x16 CrossFire support.