...when did they even confirm Viera as a new race that would be added with 5.0? I've been on holidays for a while and feel like I must have missed that annoucment (and a quick search didnt brought anything up)

And further than that: When did they confirm that we would get two new races with 5.0?
Because unless they official state that somewhere, I wouldnt expect that to happen, since I imagine that developing a new race is quite a lot of work, seeing how they would have to adjust all gear in the game to fit that race.
Furthermore there are certain lore-limits on introducing new races, I would imagine. While both the dwarves and the Viera could probably get a decent enough explantion for why they arent known in Eorzea, drawing from the respective games they appear in (with the dwarves simply living underground and the Viera in a magically hidden forest), it would probably still cause a bit of a headache to get two new races into the game without being to irritating. Remember the big deal they made out of Yugiri in ARR just to make sure that Au Ra dont interfer to much with whats known in Eorzea?

So unless they've actually confirmed any new race, I wouldnt get my hopes up for one, not even to mention two.

If anyone can provide me with a source though, I'll happly stand corrected and while I'm not intrested in new races personally, I'll keep my fingers crossed for all of you who want to be bunnies or hairy lalafell!