OK. I just finished watching Episode 7, again, and I can say that from the clues dropped, I can now absolutely state without reservation how episode 8 will begin.
Remember, episode 7 ended with Rey standing on a mountaintop holding Luke's lightsaber out to him while he stood facing her and looking at her with resignation.
So, episode 8 starts, and the scene fades up to that exact same moment.
Luke's eyes get wide with excitement and he yells out, "Hey, Jar Jar, looks like we've got company!"
Then, Jar Jar will emerge from a nearby cave, wearing his Private Expressions(tm) French Maid outfit, with the optional BDSM kit, naturally, and respond, "Who'sa is eet, massa Luke?"