Wowhead posted a finding of some new Night Fae soul shapes, which includes a bat:
According to this article, it was found on a Torghast Layer 16 run:
A shame these aren’t account wide to my knowledge, but I figured I’d mention it for anyone interested. Maybe if we get playable San’layn, those who would go Night Fae could have a bat soulshape to look forward to! 
