Information has recently surfaced about Intel's plans for its new 4 series chipsets to be released in Q2 of 2008. These include the onboard graphics supporting G45 and G43, which are to be paired with the ICH10/R southbridge.
Both are DX10 compatible and carry the Vista premium logo certification. Each also will have embedded support to output HDMI, DVI, Display-Port and SDVO video up to 1080p. There is no info currently available about clock speeds and the only disguising feature between both is that the G43 lacks hardware AC1 and H.264 decoding.
During IDF Taipei this year we did manage to speak to an Intel chap about these parts and he mentioned this is the time you can expect to see Intel make a better showing in game performance but of course judging on history, that would seem a big call. Only time will tell.
Also mentioned in the roadmap is the P45 chipset but there is very little information mentioned at this stage. More to follow as we hear it.