PS3 CS: GO supports keyboard and mouse News - PlayStation 3 - Page 1 | Eurogamer.net
PS3 will enable mouse/keyboard support. This is probably the only time this has been implemented on console since Unreal Tourney 3 PS3. PS Move will be implemented as well (no mention of sharpshooter attachment)
Cross-play is confirmed and i doubt XBL will allow it.
Beta starts in two months
5 de_ maps and 2 cs_ maps (wth needs more hosties maps! some as_ maps would be nice too)
Valve servers will match player based on skills.
All the PC fps gamers with their pent-up anger will finally be able to release it on their console foes
edit: gameplay video
they are reusing game audio from 12 years ago?

the game looks like it will play much like l4d