I got curious and asked my local Disney Store when they'd be getting Lion Guard stuff in. According to them, they won't get them in until January. And even then, there's a possibility they won't get
anything.
Having said that, I was told they were going to release Gremlins merchandise, but they never did. Hopefully this is just wrong info too (or a cover up, for whatever reason).
They said they don't get merchandise in until the movie airs usually, which doesn't make sense when TLG comes out in November... Of course, Star Wars is profitable enough to come out much sooner, apparently.