I want MMXI too! I just played the X again, for the 5th time at least, and the expansion.. and in my opinion it was the best MM to date, even though I have fond memories of MMI to III and of MM6 and 7.
Make an even more tactical fight system too if possible . With even more different team builds possible. I don't care if it gets further away from the old MMs (honestly MM6-7-8 fights were way poorer than MMX, pause, shoot arrows, unpause, move away..), as long as we keep its universe, the relics, the grid based maps, etc...
I can´t say that MMX is better than MM7, but it has some nice touches. I am more for free roaming (no grid) game, but I liked tactical fights from MMX so I think the MMXI should have fighting looking like in Wizardry 8. There also should be ragdoll type of invertory (MM6-8) and setting different from Ashan (I am really fed up of that world).
But PLEASE:
give next game to COMPETENT developers like Obsidian, Larian, InXile, CDPRed or Almost Human studios