The census got updated to include Viera and Hrothgar. Viera definitely blew up! Below are the numbers for active players per race (of all the servers/datacenters).
Female Races (from most common to most rare)
1. Miqo'te - 133,844
2. Au Ra - 93,965
3. Viera - 81,278
4. Lalafell - 60,563
5. Hyur - 53,110
6. Elezen - 13,002
7. Roegadyn - 7,175
When you add Lalafell, Hyur, Elezen, and Roegadyn, the total is 133,850. That barely passes over Miqo'te alone, which is at 133,844. Catgirls just completely eclipse over the last four races. The only other two that aren't as overshadowed are Au Ra and Viera. Viera didn't surpass Au Ra like I thought it would, but it did surpass four other races and became third most popular. I would definitely consider that as blowing up.
If my math is right, this means that for every female Roegadyn out there, there are 18 catgirls!
Not surprisingly, Hrothgar didn't blow up as much as Viera did.
Male Races (from most common to most rare)
1. Hyur - 81,390
2. Miqo'te - 69,278
3. Lalafell - 50,183
4. Au Ra - 42,685
5. Elezen - 23,439
6. Hrothgar - 23,307
7. Roegadyn - 15,507
I think out of all the races, Roegadyn (both male and female) were hit the hardest with the introduction of Viera and Hrothgar. Roegadyn is the official unicorn race.