Suspiria is a distinct possibility based on the 4K scan that's being liscenced. Personally I hope it isn't for no other reason than Synapses restoration is looking to be somewhat superior to that one. Essentially it'd be a release that i'd be upgrading not long after purchase or skipping due to owning the synapse one. Since they seem to be doing a lot of inhouse restoration however its possible they would be doing a lot of additional work to improve whats out in europe already so who really knows?
Opera would be a welcome candidate, the European release has room for improvment and it would have the added bonus of Bill olson rotating in anger. Like Suspiria however, since it means it can't be liscenced in America makes it unlikely.
Four flies on grey velvet. Well if shameless no longer have it then possible, non of the releases I've seen so far are ideal. I'm assured my Italian blu-ray is better quality than my Shameless one, but aside from the horrifying audio glitch I struggled to see the difference. No U.S release at least gives it some appeal to Arrow.
Cat o'nine tails. Given the lack of a U.S release, or any decent Euro releases in HD, a new 4K scan and extra bonus materials would seem a strong contender. As above it's underrated, though while I'm sure there are AV experts that can point out any problems the transfer on the previous Arrow release looked ok to me.
Inferno. Do Blue underground still have this? There was a big debate over how the film should look and the BU blu ray looks different than any of the euro releases. Since Lustig worked on the film his opinion holds some weight though the vaunted European release with Camera obscura appears to contadict this and support the Arrow version of the film. Either way a new restoration might be welcome. The U.S rights would be the issue.
Tenebrae. Would they? given Synapse owns the U.S rights and its not long since Arrow re-issued the film with the decent Wildside transfer I doubt it.
Demons 1 & 2. Again U.S rights though new 4k scans would probably suck money from my wallet in spite of the cash I've already blown on these films. Personally I'd say no.
Trauma. Interesting. Not sure but I think I heard this had already been liscenced in the states. Its underrated imo and I'd probably pick it up.
Two evil eyes. Again, does Blue underground still own this? Its something of a mixed bag and I still need to re-watch the film as I feel I should enjoy it more than I do. A little leftfield perhaps.
Stendahl syndrome. Unlikely. Perhaps they would go for it and put out a solid new release but as we know Blue underground
definitely have this stateside.
Sleepless. Another leftfield choice but not unwelcome. I know a lot of people dislike it but I thought it was a fairly solid giallo. No U.S release makes it a possibility.
Card player onwards...... HMMMM no thanks