MMAPayout.com has the story:
Last week’s early estimates of UFC 101 have been confirmed. We’ve had three different systems of six we’ve gotten reports on real numbers that reported the second best numbers, behind only UFC 100. The others did right at or just below other the big three of late (Couture vs. Lesnar, Griffin vs. Evans and Penn vs. St. Pierre). One national cable estimate was at this stage between 800,000 and 900,000 buys. Trending patterns indicate numbers higher than that, and if it was the same as the big three before UFC 100, or better, as indicated by the few direct numbers we have, it could top 1 million since UFC 92 hit that figure and 91 and 94 were just below.