radeonhd development is extremely slow.
anyway, i've read that the there's a team of dev working full time (ie about 40 hours a week on the driver) and this is not bad.
as for what you've said about the promo, it can be true, since there haven't been other specs releases, but until the end of the first quarter of 2008 i won't think that amd/ati would not do what they've said. and this for a reason: the next generation integrated cpu/gpu boards would not be usable on linux without proper support. for what i've figured out amd has brought ati for this reason: create a single chip with cpu and gpu inside the same chip on the dual/quad core arch. that would mean a very high advance especially in the laptops market that now is growing more and more and in which the prices go down more and more. for example i bought a notebook less than 2 years ago at 1200€ and now i could buy it at less than 300€, but it is still a good notebook for what i have inside it. medium price laptops cost from 450 to 600€ and come with dual cores of 1.5ghz each, 2 gb ram, 160 gb sata and 15,4'' display. this is now standard and introducing a cpu/gpu would mean a near revolution; more powersave => more battery life; gpu clock adjustable based on the load requirements, vram teoretcally limited by the system one and these are only the main things that a cpu/gpu on single chip would mean. but all this would not be possibile if ati don't releases the specs for this hw. and that will cut off their legs and make them loose all that they've set into this project.
and last thing: remember that apple cames most with ati hw, and osx is unix based, so considering all these facts amd/ati has only interests in maintaining its word toward the linux/unix community. i also expect that with the release of project indiana ati would release driver also for that envinronment and that would finally mean that ati has nearly caught up with nvidia in the nix based environments.
but for a final review on the matter we must wait the end of the first quarter of 2008. i expect for that date great things from ati. if they cannot give that things then you and other guys would have been right.
and for what i know having a 8xxx serie is like having an ati board. so what's this big deal with nvidia?!