Eurogamer: PS4 May Include Cloud-Based PS3 BC

[richardhutnik]

platformmaster918 said:
This could be separate from plus I think. Gaikai for $50 a year (demos, trials, and BC), + for $50 a year, $75 a year for both in a bundle or something.

Why separate it?  Why not just have it as another level to Playstation Plus for PS4 owners?