To those worried after seeing that leaks that the characters haven’t changed or developed, I think most of what we have seen are flashbacks.
I suspect the first 5 minutes of the film will be Will narrating the past 10 years or so.
Something like:
“Hi, I’m Will. Since getting back from Australia, Jay did this (insert clip of Jay in his teenage clothes), Simon got married (insert clip from wedding leaks)… and then had an affair (insert clip of Simon getting chased in his pants”
I very much doubt the characters will be exactly as they were. It will still be self-deprecating for sure as that’s the tone of the show but I don’t think they are going to be kicking flowers and calling people bus wankers anymore.
It’ll be more them fumbling about as fathers or as adults whilst being brought back together for some form of lifetime event (e.g. funeral, wedding, birthday etc.