I'd be surprised if he was cashing in tonight, I think they're just promoting the possibility to get a few more buys from people thinking he will, which means he won't. I think it's more likely that he'll wait until after Sheamus' Hell in a Cell match next month.
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Predictions WM28 onwards:
WM28 - xCena, xJericho, Taker, Sheamus, Show, Kane, xTeddy, xBeth/Eve = 50%
ER - xLesnar, Sheamus, Punk, Orton, xBig Show, xNikki = 50%
OTL - Punk, Sheamus, Laurinaitis, Kofi/Truth, Layla = 100%
NWO - xBig Show, Sheamus, xBryan, Christian, xBeth, Santino = 50%
MITB - Cena, CM Punk, Ziggler, Sheamus = 100%
SSlam - Lesnar, xCena, xKane, Jericho, Miz, Kofi/Truth, Sheamus = 70%
NOC - xCena, Sheamus, xLayla, Orton, Cesaro, Kane/Bryan, Miz = 80%
HIAC - xRyback, xSheamus, Rhodes Scholars, xDel Rio, Kofi, Eve = 50%
SSeries - Punk, xBig Show, xFoley, Eve, Antonio = 40%
TLC - xTeam Ryback, Big Show, Ziggler, Kingston, xR-Truth, Rhodes Scholars = 70%
RR - Miz, Hell No, Del Rio, Punk, Ryback