I've scant interest in a new race, let alone one as similar as Viera, especially if they're going to be foisted onto us haphazardly like the Au'ra were. Added options are nice. Bare minimal context to excuse said options, when the means of addition (e.g. a race) would normally encourage or even require deep context -- not so much.

Improvements to clipping and cloth physics, so that our robes are no longer extended as if by wire meshes beneath to make them as awkwardly puffed out as possible, on the other hand, would be a damn good reason to come back for Stormblood.