Would be redundant to add a lizard race, we already have Amal'jaa who look really reptile-ish already. Even if they are not playable.
As to adding Vieras, I'd find it so sad and unoriginal. They were a FFXII race, adding them to FFXIV, which is a totally different world would be tasteless imo.
And adding uni-gender races would just make the whole player base cry for the missing counteparts, as many people said.