I would wait till E3. I got really disappointed when I bought a Wii U and Nintendo started to ignore it after just 2 years and if there is a PS4 revision the same could happen, with the producers moving their projects to a more powerful hardware and the original PS4 starting to be ignored. Sure, the games can be compatible with both hardware, but we know that there is a huge risk of these games performing way worse on the normal PS4.