Alrighty, I understand this is probably an unpopular opinion, but I think Disney should create a princess based on their personality and story, growth, morals, etc., rather than trying to please various groups.
Don't get me wrong, having Tiana, Mulan and Pocahontas was fantastic (I even have strong Native American heritage and am very proud of it), but when I look at a Disney princess for inspiration, I don't look specifically because she's the same race as me, I look at it more like :
Belle: Brains, kindness, doesn't fall for stereotypes
Pocahontas: Family values, culture differences/overcoming obstacles, love beyond borders
Mulan: Sacrifice for those she loves, feminism (in her defeat of Shan-Yu as a woman/herself)
Of course, it's perfectly acceptable to look up to someone and see that they're the same race as you and admire their feats, that's absolutely fine.
But when it comes down to "Let's have a Disney Princess because she's Latina", and not for what story could they tell, just her race, it seems... I don't know, odd to me.
I hope I'm not offending anyone here

And if anyone does take offence, I'm very sorry!