What if the reason why there isn't a new race is because...

[Dualblade]

If we were getting any sort of new race option, Viera hybrid or otherwise, it would have been announced at one of the last Fanfests AND most likely would have had already have a character related to Stormblood around to represent it.

This isn't to say nothing will happen for the rest of the game, or even that they really are waiting till the EU Fanfest for it. But its very unlikely for 4.0 at this point.

On the topic of hybrids though...if Hyur/Elezen is ever introduced hopefully there will be more options to make them more...Elezeny I guess would be the word. You could lie to my face by calling Hilda a Hyur and I'd believe you because there aren't a lot of differences.

Mi'qote/Lalafell seemed pretty popular around the time people were wondering if the Mi'qote orphan in Iydlshire was such.

Hybrid race options don't really make sense lore wise. Hybrids aren't impossible obviously (although some combinations probably are) but they are extremely rare, rare to the point that we've only met one after traveling all over Eorzea.
A thousand hybrids suddenly appearing in Limsa would be silly.

To be fair the story wouldn't treat it as if there were suddenly a lot of them around. Male Mi'qote are still somewhat rare and aren't running around in nearly the numbers that players would have it be if we counted all of them. Same with ALL the Au Ra players, more so in 2.0 content.