I tried to give it a go, honestly, as at one point I was a Daz user.  Unfortunately, DS4 will not run on my computer at all and 3 was terribly glitchy. 

Some of what I have seen coming out is impressive, but I admit, Daz's materials handling and rendering engine leave much to be desired.  Which is truly sad given that 3Delight is a wonderfully solid engine if they could be bothered to implement it to its full potential.

Am I concerned that Genesis will not work in Poser 8?  Not really, I have V4 who needs a convoy to move her wardrobe.  There have been concerns raised over how the auto fitting of V4's wardrobe effects the clothing, including that movement morphs etc may well be lost when using them on Genesis. 

Also, echoing what Bagginsbill said earlier, I don't think we have seen anywhere near the full potential of Poser's new rigging exploited.  Miki3 certainly didn't.

Heck, Antonia uses the old rigging to the best of my knowledge, and her joints are a thousand times better than V4s.  If we had a figure done to that sort of standard with the capsule system, who knows, maybe people would be less enthused with Genesis.

Though I do find it interesting that Maya is now integrating a system similar to Poser's capsules... Maybe it is that Daz isn't setting a path to the future, but instead hoping to embrace what other software has known for years while they, along with Poser are the ones moving forward?