Hopefully they keep the momentum up, January is ending on a strong note between this Developer Direct, Game Pass (Persona 3, 4, MH Rise, JoJo's Bizarre Adventure) and 1st Party (Age II on Xbox, Goldeneye HD, Hi-Fi Rush) but February is fairly silent for Xbox aside from Atomic Heart, March starts strong for Game Pass with Wo Long and also will have Ghostwire Tokyo, April - May both have a 1st party release and June is obviously E3.
So looking at the schedule, I'd say February would be the best month to have the Starfield showcase, between Hogwarts Legacy and Atomic Heart and if that happens then Xbox will have a steady stream of positive news flow leading into E3. It'd be a shame to have a great event and then go completely dead in February aside from regulator updates, Lol.