While, like @SmokerT69, I’m not expecting much because most of the team is working on WoM, I still think (and hope) there is some kind of event. Something akin to the bonfires in winter or the skull collection would be nice; something requiring a bit more effort to do than “play QP 10 times”. FS has banged out awesome events with just a couple of guys in a short time, so it’s not unheard of.
And yeah, I suspect that for yearly events, each year will bring new frames to brag with. I wouldn’t be horribly surprised if some of the older ones were brought back too, but I suspect at least one for each event will be kept as an exclusive, for people to show how long they’ve been playing.