It wasn't Adobe Flash Player RC7 being uploaded to the Ubuntu repositories, but 10.1 final, I was mislead by the fact that only now Adobe announced the release of the new Adobe Flash Player 10.1. Ubuntu packages are really fast!
Adobe Flash Player 10.1 adds graphic acceleration of H.264 - unfortunately for Windows only -, as well as many other improvements such as private browsing support, accelerometer and multi-touch support, better streaming performance, content protection, and peer-to-peer broadcasting abilities.