Since Mattel now has the Filmation license, I think a perfect candidate for an SDCC exclusive would be a:
'Deluxe' Filmation-Blue Hordak and could come with...
- new paint deco (of course)
- multiple arm attachments
- multiple head attachments
- one alternate 'full body' form (e.g. Rocket or Drill)
And I still believe the recent MOTUC Q&A 'strongly hinted' at multiple 'color' variants of the forthcoming Snake Men 2-pack which could possibly and logistically be one of this year's SDCC exclusives... Guess we'll have to wait and ssss-ee.
These would also make for a nice mix of factions (Horde & Snakemen) for this years SDCC exclusives. Maybe even a third 'heroic' faction exclusive would be cool too, to round out the exclusives? I mean, it is the "30th Anniversary" and all – one exclusive for each decade!