Sources in both WWE and UFC are skeptical about how bad the recent meeting between Dana White and Brock Lesnar really was. White said that the meeting was one of the worse he ever had with Lesnar and not part of a WWE angle but there are people on both sides who believe it was.
WWE sources almost universally believe that Lesnar has an iron-clad deal and there is no way he can fight for UFC until that contract expires after WrestleMania 29 in 2013. In UFC, people are insisting that Lesnar's WWE deal is non-exclusive and that he and White were discussing a potential fight during their recent meeting.
Not everyone in UFC thinks Lesnar will fight with the feeling that even if his WWE contract allowed him to fight, his heart really isn't into MMA and this is all some sort of ploy by Lesnar to increase his bargaining power or leverage with WWE.