To be fair, Shirogane housing (despite being able to visit the area during that time) was not added until the following October, around 3 months after the expansion had been released. Granted it was a game-wide addition and not specifically to a couple of worlds, but considering how long it is taking now I'm kinda expecting 5.1 again to see anything happen.

Not sure which world you transferred from AguaDoce but I probably wouldn't have gone ahead with it straight away if housing was your main aim of moving. Could have been safer to stay where you were and see if housing opens up there or if not at least wait it out there till the new worlds got a set date for release then you know when/if you want to transfer.