Some back of the envelope calculations:
The hispanic population in Arizona grew from 25% to 30% between 2000 and 2012. Projected linearly, that would give Arizona a 31.67% Hispanic population. link:
http://www.tucsonweekly.com/TheRange/archives/2013/06/14/hispanics-leading-minority-growth-in-azIn 2012, Hispanics made up 18% of the Arizona electorate. The share of Hispanics in the electorate is 60% of the share of Hispanics in the general population.
http://www.cnn.com/election/2012/results/state/AZ/presidentAssuming Hispanics and whites vote in 2016 at the same rates they did in 2012, Hispanics would make up 19% of the population, only a 1% increase.
However, in 2012 Arizona wasn't heavily contested. If Democrats focus resources on Arizona, they could increase Hispanic turnout.
In Nevada, the portion of Hispanics in the electorate is 69% of the portion of Hispanics in the general population. This kind of voting pattern would put Hispanics at 22% of the electorate in 2016. That would get Democrats up to perhaps 47% of the vote, with an Obama 2012 performance across demographic groups.