AoE 2: Definitive Edition
TBH, it's probably time something new is shown, even if it's just a CGI trailer with 15s of gameplay.
Even that would be important. Showing How Close AOE4 is to AOE2/1 and how innovative it is may be a good barometer for what relic may try to do with Coh3.
Obviously DOW3 was the wrong combination of new and old and so I would hope they find a new balance in future projects.