~2.4M sounds like a reasonable guess. Really anything between 1.8-2.5 is reasonable. Anything over 2.5M and we are talking about a very successful month for HW (Sony's best November in a really, really long time... maybe ever).
Best Sony November is PS2 1,318,000.
Yeah, looks like PS4 has a good chance for beat this, even if i don't think so.