Per last week sales chart, Brink has sold 547,567 copies on 360 the first three weeks it was out, and 223,473 copies on PS3.
(I’ve heard that this site’s numbers aren’t entirely accurate, so let’s not get caught up with the exact count.)
PC has had maybe ?22,000 sold, based on Steam’s player count high of 17,000 or so.
We’ll only know if there’s an internal leak.