According to Star Wars News Net, Mark Hamill’s movie character – Luke Skywalker – will make an appearance in the first trailer for The Last Jedi.
There are rumors that Luke will not be in the first #TheLastJedi teaser. We heard the contrary. Luke, Leia, Finn and Rey will be there…
— SWNN (@StarWarsNewsNet) 13 februari 2017
The most likely expected date for a Star Wars: The Last Jedi teaser to drop is at Star Wars Celebration which is during April.