I'm mostly just curious to hear about his reaction upon seeing the new trilogy. Will he think, "They did a good job. My work is in good hands." Or will he think, "OMG, what a pile of garbage! I can't believe I let Disney do this!"
And, of course, it doesn't have to be either extreme. I mean, I imagine there's bound to be a pang seeing your baby move on without you, especially after shepherding it for a good chunk of your adult life, and I'm sure there are things he would have done differently, but there may well be parts that he quite liked as well. And I like to think that he knew what selling the franchise meant: that he would have to sit back and let somebody else take the wheel from now on.
Honestly, it's probably like anybody who retires after devoting their life to a career or a business. It's going to be hard letting go, but a relief too.