Considering how development works, there is a strong possibility that there are already 'basic' (but incomplete) male viera models. What I would assume is to be the likeliest of cases is that somewhere through development of Viera they stopped and switched to Hrothgar. The thinking, probably, was whether people would just want Male/Female Viera as the final race, or two races that are genderlocked (with the thinking that Male Viera and Female Hrothgar would not be popular choices anyways). I think they gambled that people wanted more races, even if gender locked.
Considering fanfest, I think they guessed somewhat wrong. THe audience reaction to Hrothgar reveal wasnt huge excitement. It was more "Aww" disappointment overall. Factor in the flurry of posts across most of the forums, it does seem reasonable that SE is heavily considering spending resources giving the player base both sexes. Which is fine. I want them too, to be frank. Like in other threads, gender locked races in most MMOs are typically unpopular with certain exceptions (the magical girl trope, as an example.)
So yeah, if there is enough player interest in both (which I imagine you will see), we may get it in hte end. And it may come mid Xpac as a means to keep in game interest going. We'll see though. All Im thinking, though, is they wouldnt say they were looking at player feedback so soon after fanfest unless the reaction to it was not what they were expecting and are worried it may damage the brand.
Just as a quick aside to this point: This is FFXIV, not Tactics. Not any other ff game. There is 0 reason they have to keep 100% to the lore of another game that is only connected to this one through the loosest of instances. This isnt a contiguous universe. Even the Ivalice story isnt exactly a carbon copy of the original. Its an FFXIV spin on it. In fact, most of FFXIV is a spin on previous FF games, but not a 100% carbon copy. It borrows a lot of elements but its not a clone of it. There is no reason FFXIV cant have male viera and distinguish hat this isnt tactics. Nor is there any reason the lore cant evolve to include Male Viera.