I would wait for Gamescom.
We got the Age 4 announcement at Gamescom here in Germany. The german age community is one of the biggest age communities at all. Furthermore Europe is the old "core region" for RTS (as far as i know RTS sold better in EU compared to other countries) and Gamescom is no "premiere exhibition" compared to the "all the time a new game announcement E3".
So i think Relic/Microsoft were afraid that Age wont get any attention at the E3 with all the new shooters, rpg games, battle royal games and co..
This could be true