Anyone that reported that it "may be a BLU mount" were doing nothing but speculating.

It doesn't even make sense for it to have been a BLU reward, considering only the first raid BLU raid achievement had a mount attached to it and that mount had nothing to do with either raid series.

The only reward for the second BLU raid achievement was a title and I expect the next tier to be the same.

People are delusional.