I'm silently hoping for a TIE Defender.
Since the TIE Defender got featured in the REBELS series, I would think it stands a greater chance than it did before. But Hasbro has likely shifted their focus to the current film and tv projects. The TIE variant I'm hoping for is the TIE RB (or TIE Brute) from SOLO. That was a really cool new take on a TIE fighter!
As for anything else?
VEHICLES - I *THINK* we're going to see a vehicle for the RESISTANCE line and some more figures. As for TVC? There are the rumors of a couple of vehicles, and it sounds like there's an X-wing and possibly a reissue of the Skiff.
FIGURES - We got so much information about the TVC line that I don't know what Hasbro can tell us that would be surprising. Wave 4 is shipping and we know the character lineups for waves 5 and 6. The big reveals would seem to be for the retail and convention exclusives.
The only significant surprise that I'm hoping for is for Hasbro to have some prototype figures for the return of CLONE WARS as the return of that series is coming this fall.