I think MS are currently waiting for Sony's move. If they do a early 2020 reveal I think MS will have an event a few weeks after them but if they don't do it until late April/May I think Xbox will be happy to just leave it to E3. If the rumoured mid February for PS5 reveal turns out I think MS will already have a early March event pencilled in ready to drop more info. I don't expect anymore games to be shown before E3 though just more console stuff.