TFA Sari transplanted into Bayverse would be kinda neat, depending on how they execute the idea. Would give a pretty darn good reason for the main human character to be the supposed female teen in TF4 and to involve her in the Cybertronian war. That and I never liked how they just introduced Pretender Alice in ROTF and then we never hear about what was the deal with her (a Con masquerading as a human) ever again. Soundwave I hope returns in some form. Maybe he backed up his consciousness in that orbitting satellite he hacked into back in ROTF, or perhaps another (unseen) minion (like Ratbat) that survived the battle of Chicago.