Edit: This is done.
The EA Forum will be down for ~1 hour tonight (April 13th) around 9:30PM PDT (Tuesday 4:30AM GMT)
Stealing from a similar announcement post you may have seen:
Our database provider (Mlab) has been acquired by a separate company (MongoDB) and as such our database needs to be migrated to that new provider. In order to do that, there will be about half an hour of downtime on [date].
Sorry for the inconvenience.
And we're back.
That was about 7 minutes, for the curious.
See you on a new database, EA Forum.