1) Yes or No to Cathar being the new race?
They wouldn't have been my first pick to add, but sure, why not?
2) If Yes, why? If No, why not?
New stuff's always good, they're present in-game and established in lore, they fit BW's requirements for a playable species, and there's evidently demand for them.
3) If Yes, Species you would also like to see, if any? If No, Species you would rather see, if any?
All of them! No, but seriously, Togruta, Voss and Nikto are what I voted for in the 'demand for species' poll.
4) Do you feel Cathar are too Republic aligned to fit well as a section for the Empire?
Maybe. But the same (and reverse) is also true for many species that have become playable through Legacy. Plus, there'll always be individuals that deviate from the norm.
5) Do you feel Cathar like most already implemented species resemble humans to greatly?
Hardly. Compared to the already available species, I'd say Cathar are the most nonhumanoid yet.
6) Addition Pro/Cons towards or against Cathar?
Nope, can't think of any.