Will likely remain the same: The brand split

Before the deal between Fox network and World Wrestling Entertainment was even finalised, there were a lot of rumors that WWE would end its brand split. These rumors, while unfounded, are based in simple logic; With a new network to garner viewers for, the WWE would be behooved to utilize their full roster.
However, this is not likely to happen. The brand split isn't very old at this point, at least in its second incarnation. Also, if Fox wants to make changes to the program--and all signs point to the fact that is their very intention--then keeping the brands separate would help to sort the rosters into camps apropos for their brand home.
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For example, if Fox doesn't want comedy, then the New Day might be better off on Raw. Likewise, more serious wrestlers like Dolph Ziggler might be more at home on Smackdown.