don't think I'm insensitive to as this. In fact I wrote a lengthy tribute to Nimoy in the general trek discussion.
That being established.. will they address the fate of Spock Prime at all?
Spocks father lived to be 210. Spock would be about about 160 in the current tng timeline. Spock could go on for another half century. If they want to mention he went back to his own reality that would be fine but other than that I say leave it alone.
Sarek was full Vulcan. Spock is half human, as far as I know there are no data points on the life span of a Human/Vulcan hybrid. That being said, if they do decide to do a tribute and have the Spock Prime character pass away off screen, I hope that they handle it in a respectful manner, respectful to the character and to the actor who was so much more than just that character.