I have resisted watching so far. We'll just be missing it on our June trip so it's really tempting but DH & I can catch it in Sept...then we'll have another family trip next January when DS can see it. DH is adamant he doesn't want any spoilers.
I won't watch videos of any of the new stuff, but I'll get to see it in person shortly after it all starts. If I had to wait 6 months or a year, I'd probably watch the videos!