Honestly, I would just take a two week break. xD
For me, my chapter covers are pretty simple (just a small shot of the next environment) so it's a sneak peek of the next place our heroes will go and sets the mood in a way, but it's also something that doesn't take me long to draw, so that's my normal little one-week "break."
I've been thinking I might take a longer break before the next chapter, to get a little more comfy with where my buffer is, but I'd just keep that as a break. My chapters are only 50ish pages, so doing a cool intermission after each one would be a bit much for me. xD
But if you do wanna do something, I think it depends on your audience! When I was at one chapter I really hadn't gotten enough of an audience to be sure of a Q&A, and I felt like it was early enough in the story that I wanted most questions to wait and be discovered in the comic. But if you've got an engaged audience that asks questions and is attached to the characters, go for it!
If you feel like the place your story is at might leave your readers struggling to think of something non-spoilery to ask, or your readers aren't super talkative, then sneak peeks, some cool world information, character bios, that sort of thing might work better and give them something neat to engage with!