He’s been pretty honest when it comes to telling people what they should avoid, and as much as Lucasfilm and Disney want people to see the new trailer, the fact is that people actively avoiding spoilers don’t need to see it, they’ll be buying tickets anyway.
At this point, we’re guessing that whatever spoilers are contained in the new trailer are going to be minor.
FIrst of all, if the spoilers were bigger, Rian Johnson would probably be less on the fence about whether or not fans should watch it.
This is also the other reason there probably aren’t any major reveals in the trailer.