STAR WARS: THE LAST JEDI Teaser Posters Get An Unexpected LEGO Makeover

@Nightwing1015 - once this triology is finished we will get more stories(comics, shows etc ) leading up to this era + with in it.
When it comes to Canon, the films take priority. They don't want to put restrictions on the story of the films. Hence, events are kept ambiguous. We know Kylo betrayed Luke's Jedi order and killed them but we don't know the details. If they set a canon comic showing the details of that betrayal story, that would hinder future stories of the films as they would beholden to those events which may not be the writers/directors vision.

Clone Wars and Rebels work as the era they are set in the main stories of the films have been done, hence they can weave in the stories of the clone wars and rebellion around them.

I feel the next animated series after Rebels will definitely be in the Sequel Era or related to it.
Following Luke and Lor Tekka finding force sensitive children for the new order would be a great story for the a show, allowing for planet hopping and exploration of the Galaxy. And a great finale to the show will be seeing Kylos betrayal.

@Trumpool - I fear it's gonna be a while still. The full trailer for TFA was released in october, the day they opened ticket sales. It was sooner for Rogue One but that was a bit special. So I'd say a couple months still.