I posted my thoughts on Twitter, and I'll leave them here as well...
"Overall, I give the Jurassic World
#FallenKingdom trailer somewhere between a 7.5 and an 8. The effects look great, and it explains the premise nicely, but could have used a more tense scene and some more tasty dialogue. Also, giving away the Rex/Carno scene was a bit much imo."
Score would probably be knocked up to at least an 8.5 had we not been so spoiled over this last week.