Don't play with my heart. Cross Save is my literal most-wanted feature.
I know this is asking for too much but the biggest cherry on top would be a Fortnite-style account merge feature. I've been playing on XB1 for the past few months so my "main" progress is there. But there's a lot of stuff I have on PS4 that I never got on XB (Leviathan gear, all the CoO Forge and EP gear, Luna's etc). If they could offer a one-time account merge which just added the Triumphs and Collections from 2 platforms, and henceforth via cross save you could continue using your new, unified account on any platform....
The absolute dream.