Will a same sex CA marriage be recognized later in NV if it is ever legalized?

You ask two questions -- as to whether out of State residents can wed in CA, you need to check on the CA marriage laws to see if there are any requirements of residency or otherwise, waiting periods, etc.  My guess is that the information you want on that point is posted. On the second question, the short answer is probably yes, but the process is still in transition.  Every indication is that Nevada will do away with its unfortunate constitutional amendment, but the initiative process will take another couple of years.  In the meantime, the family courts and lawyers have developed a large number of workarounds on every subject from parenting agreements to surrogacy contracts to adoptions to divorce.  So, for the short run, yes there are more steps; long run, probably the law will fall into place everywhere to treat such marriages like all other marriages within another 3 or 4 years, by legislative or court action, or both.