I think a lot of people's expectations are bumped by these "insiders" saying otherwise.
I think the safest conclusion is that it's going to be a PS4 revision with HDMI 2.0 for 4K at 60fps, and possibly some hardware changes for PSVR support, but games will essentially be similar. You can expect 4k blu-ray support and Netflix support, and possibly 4K USB media support. For games, it'll really depend on the developer whether they want to utilize the ability to make games 4K. However, don't expect any crazy difference.