Have PlayStation 4 Details Emerged? - PS3 News at IGN
"Furthermore, according to Kotaku's source, Orbis will not feature backwards compatibility with PlayStation 3 games and will incorporate some sort of used-games restriction. Apparently, once a consumer inserts a Blu-ray disc into Orbis it must be tied to a PSN account and can no longer be shared. The data can be installed onto the system and flagged as "downloaded" from the PSN so it can be re-downloaded for future use. Sources are "unclear" as to how the disc functions following this, though one possibility is that the disc can allow consumers to access trial content before purchasing the full game on their console."
Just rumors and speculation at this point, as is with the new Xbox. Not much different in terms of attempting to squash the used game market and possibility of no backward compatibility(being able to play older generation of games).
I had a day one 360 for no other reason than it came out first. This time around I will wait until both systems are on the market to see what is truly going on before I move up to the next generation of gaming.