As for the promo you're talking about, it could mean that Palmer will perform in some flashback scenes. But it won't mean he faked his death.
Yea but it would be interesting if he was alive and exposed a corrupt administration. Of course logan is just inept, not corrupt himself. We shall see. I have heard there is going to be some very surprising turn of events from FNC personell but they said they ain't talking. Remember the bad guy was only mentioned on Palmers puter, not on the written draft.