I doubt PS3 can do another 1m in a week but what do I know.
As for US sales x360 still rules (over PS3) but the rest of the world is a far bigger place.
If PS3 can hang within 20K of x360 in NA and win by over 100k in the EU\other regions you don't need to be a maths genius to figure out the outcome.
Hell, even the usual 50k PS3 gets over the x360 in Japan negates the US advantage and then some.