For the longest time people have been requesting more playable races. Among the most requested races people wise to play would be the famous of races in the Star Wars Universe. The Nautolan race! Despite issues regarding helmet, this should be easily fixed by coping the Twi'lek race helmet fix by having the tentacles hang out the back of the helmet.
I'm positive that the Nautolan would not only be a popular addition, but would also lead to many people purchasing additional character customization which could be added to change the hair style of both the Nautolan and Twi'let races.
I'm sure you have your reasons for not implementing the race yet; but I think with talk about revealing the Voss as a playable race, the Nautolan should be seriously considered as the next (or hopefully before) playable race.