New Road Sign?

[aislingk15.livejournal.com]

I know this is technically about Medford, but since it's a block away from Powderhouse Square, I figured it was relevant.  Today I noticed that there's now a "No Right Turn" sign at the corner of Boston Avenue (coming from Ball Square) and Harvard St.  Does anyone know if this is a temporary thing related to the road work they've been doing for a few months, or something permanent?  There's still a "Detour" sign attached to the post, but the turn prohibition sign seemed pretty permanent too.