According to the blog, per-site Metas have opened up for all sites except for the special case of SO/MSO. (Discussion about the special case is discussed further here.) Area 51 is not mentioned, though. I understand that it's not exactly an SE site, but doesn't it deserve a place for meta-discussion?
Three options come immediately to mind:
- This is by design. No meta for A51.
meta.area51is coming in 6-8 weeks, just hold your unicorns.
- MSO is supposed to be the Meta for both A51 and SO, in addition to being the "national capital" (I'd be okay with this; I just want clarification on whether it is in fact the case.)