I think for the Infinity Saga we need something really special.
I know they did the Briefcase with the Tesseract for Phase 1
The Orb from Guardians of the Galaxy for Phase 2
So it would be nice if they had a another one to finish it off, however the problem is the past 2 editions featured just one Infinity stone. If each one included 2 then we'd have the full set so I personally think we need to have an edition with a stand holding a replica of each stone outside of whatever container they are in. Really nice high quality ones with a shine to them.