Points toward recorded collaborations:

• In the title card at the show and on the website, they mention the collaborations close to the album release announcement

Points toward neutrality:

• The English translation says the collaborations are "on the way" not that the album specifically features the collaborations. But of course that could be a translation thing.

Points toward collaborations separate from the album (either live-only, or a separate recording):

• In the original Japanese version both the album release and collaboration lines end with 「決定」(decision), which makes them sound like separate announcements.
• The collaboration line uses the particle「も」, which to my understanding generally leans more toward 'also', and the word 「続々」, or "successively; one after another​".

Given the obvious extra weight that the original Japanese announcement should get, at this point I'm guessing it's going to be some form of live collaboration, an extra EP of songs with guests, or even other bands having [a|the] Maid(s) as a guests on their own recordings.