Yes, QA is important because a feature may be working for some time but this can get horribly undermined by a regression in another part of the driver thus rendering the whole pretty useless or unusable. So, even if there is a target release, nothing is sure until you get the final release of the driver out. However, there are strong constraints to get this out at a specific time.
This won't change much. Any normal and sane person willing to buy X or Y will check if this meets his requirements right now. Otherwise, he would never buy anything. And, at this time, the best working solutions for H.264 decoding available to Linux are Broadcom, Intel and NVIDIA. Needless to say, this is in lexicographical order.
That info is absolutely nothing for NDA because everybody who has got the hardware or intends to buy should know that!