The beatles-rock band game

What I read about it:

-40 or 45 master songs of the beatles

-20 or so songs from others artists

-peripherals from rockband2 will be compatible and the beatles peripherals will be compatible with rockband2

What I want to know:

-Will we be able to download the song on the hard-drive like the rockband1 song to play it in the rb2 game????

Confirm my information and\or add some if you have.... I'm not sure about the 20 songs from other artists...