I agree for the most part but I just want to extrapolate on the 4K concept. I felt it was pretty clear that Blu Ray would be the medium delivering 4K movies when Sony announced their moving forward with 4K content available on new movies. This was at CES. Sony even announced they will be providing a digital distribution service of 4K video. The PS4 will most likely have a good blu ray drive in it to read games faster. This blu ray drive will most likely support 4K video playback. I'm not sure if current blu ray drives will be able to handle 4K but maybe the blu ray disks themselves can handle older blu ray drives and keep lower resolution content, allowing the new blu ray disks to be compatible with any blu ray player. Unless they have to have different 4K disks, then maybe they will sell 4K movies separate or have them contain multiple disks.
While the new blu ray drives will be more expensive than current variety it will not be to the extent when blu ray was first introduced as they step in technology is far different. The difference in price might not be very extensive at all and given the new drives will help with game playback, this is an excepted cost. Sony won't want a cheap slow drive creating a bottleneck and holding its games back. A 4K blu ray player is not going to be a brand new technology. The PS4 is expected to sell 50-100 million over the course of 10 years and having it capable of 4K playback will be important for Sony's new direction.
Before the PS3 everyone was nice to me :(
