Last January the art gallery PiRats announced that it was going to close. A flurry of efforts, including crowd-funding and the allocation of a LEA sim, kept it going for a while. But a few days ago Merlina Rokocoko, one of its curators, announced the gallery's end, although they hope to continue PiRats with occasional once-off projects.
Flora Nordenskiold, who ran the Norden Art Gallery and left SL entirely for a while, returned to Second Life and now blogs about SL art and other activities, but I haven't heard anything to suggest she'd thinking of re-opening her gallery.
So, the contraction of major independent art spaces continues (see my earlier discussion of the issue).
