From the official Star Wars instagram account…
‘Get ready. Trailer tomorrow. #StarWars #TheLastJedi’
https://www.instagram.com/p/BZ-_eYXhQxW/
(the instagram link features a very brief video too…)
I have heard rumors that tickets go on sale tomorrow as well.
Apparently so mate:-
http://www.starwars.com/news/star-wars-the-last-jedi-ticket-offers-and-giveaways
and according to this Regal Cinemas webiste…
https://www.regmovies.com/movies/star-wars-the-last-jedi-opening-night-fan-event/B00523608104
The Last Jedi will have a run time of 2 hours and 35 mins.