Rumor has it canon is/has already discontinued the 5DMKII. I think the 6D will definitely replace, not compete with it in the very short term here. So they could bring it in at the current 5DII price or higher. Based on recent history bet on higher. With the 5DMKIII way up at $3500, they got lots of room to go higher. I hope its no higher than $2500. Not sure I'd buy it at that, but too close to the 5DIII if it goes any higher.
-Brian