The purpose of the title card, which the Star Wars opening crawl more dramatically replicates, was to let you know what you missed if you hadn't caught last week's episode. It's also a way to sift in "meanwhile" information to set up any new story points the next episode starts with. I, personally, hope TLJ doesn't start on Ahch'to right where TFA ended. I hope the opening pan-down-to-planet scene is the new capitol, or the First Order's redoubt, and then after that cut over to Ahch'to to pick up that tense moment between Luke and Rey.
--Jonah