Girls, I have a theory. Have any of y'all played a Super Mario game? Each level is structured in stages, and a group of stages form a world. I think the Rooms is just the first "world" of antidiary. We are likely to have a world each month. November-December was Rooms, maybe next month we will get Houses, so:
World 1 - Rooms - November/December
World 2 - Houses - December/January
World 3 - Streets - January/February
World 4 - Cities - February/March
World 5 - Countries - March/April
World 6 - Continents - April/May
World 7 - Planets - May/June
World 8 - Galaxies - June/July
Each world has 8 stages, world 1, had 8 stages/rooms, next world will have 8 stages/houses. We will get the album at #G8, at the end of the campaign in July. We might get a new song at the end of each world, but I wouldn't expect anything.
I cracked the damn code.