Mar 17th - April 15th were Episode 1 related UQs.
April 15th until May 26th have been Episode 2 focused. We will have to see if the 26th shifts to Episode 3 focused UQ.
The weapons and units haven't changed yet. The big Falz boss of Episode 3 has new weapons and units we don't have access to currently, but unsure of when that will arrive.
The Hatsune Miku "collab" is the first collaboration, but it is really just an AC (money) collab with a concert, so I don't count those regardless of what anyone says.
Should get the Sonic Lobby in June sometime.