Yes, that is a pellicle. "Broken ice shards," fluffy textured layers, (big) "slimy" bubbles, etc.
Probably from some bugs in the Sourvisiae.
It's an intentionally sour beer, so chances are it should be good.

Kegging is safer than bottling in this case.
If you want to do clean beers using the same equipment, everything that was touched by the sour beer needs a good cleaning, scrub, and sanitation. Rubber parts (o-rings etc.) and anything with tight spaces, such as that fermenter spigot, threads, etc. need special cleaning attention. Or just keep those for sours, and get new rubber parts for clean fermentations.