Will likely remain the same: AJ Styles

When the WWE was shopping Smackdown to Fox network, one of the most prominent superstars they featured was AJ Styles. This was done for several reasons.
For one, AJ's gimmick is far less outlandish than, say, Undertaker or Bray Wyatt's. He portrays a professional athlete, and most of his character is wrapped up in his ability to excel at the sports like aspects of pro wrestling.
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Add in the fact that AJ is considered one of the best--if not the very best--professional wrestlers in the world today, and it's a no brainer that he was used to sell Smackdown to Fox.
With such a sales pitch, it would seem illogical for the WWE to remove AJ Styles from Smackdown at this juncture. So fans of WWE's blue brand can probably look forward to seeing the Phenomenal one dazzle for some time to come.