You can think of Gallium as "a new driver model for mesa". Mesa will continue to be important.
what does this new dri2 implies for other boards users?! i've tried compiling the git mesa yesterday and i got an error. i don't remember what it was since i was in a hurry and didn't have the time to see it out but i'd like to know if this new dri2 part has some influence on the other brands boards.