In general, the first step to alerting you all to when the patch is planned is with the all Worlds maintenance announcement and in the case of major Patch releases (like 2.1, 2.2, 2.3, etc.) the release of preliminary patch notes. Normally we don't release prelim notes for the .x1 type patches; however, since the release of the Manderville Gold Saucer is pretty substantial and features a lot of new content, we may do something different this time.
Nothing is quite solidified, but keep your eyes peeled!