Source: The Wrestling Observer
There is said to be "nuclear heat" on Brock Lesnar, partially because of his recent appearance at UFC 146. Lesnar showed up at the PPV and met with Dana White without Vince McMahon's advance knowledge, which has a lot of WWE officials angry. Lesnar has reportedly been very difficult to deal with since he signed on with the company, similar to how he was during his first run with the company only making more money and working less dates.
WWE has taken a couple of shots at Lesnar in recent weeks, including Big Show's promo where he talked about being a "fighter, not a sports entertainer" and Triple H not wearing an arm sling to sell Lesnar's attack during his taped promo. The company is keeping Brock completely off the radar until it is time to start building toward his match with HHH at SummerSlam. He is expected to be off TV after for several months as well, with no word as to whether he'll be at at the Royal Rumble.