“This story takes place before the Clone Wars and it’s set in a world we’ve never seen before. I was always just intrigued by that idea. You know, we’ve seen Yoda as the teacher, as the wise Jedi Master, but I wanted to see Yoda just as the Jedi. So this puts him on a very unusual adventure. The other big challenge with Yoda, of course, is finding something that’s a challenge for him, right? Who can pose a threat to Yoda? I think we came up with an interesting answer to that question. That’s part of the mystery of this story. There’s a very specific reason that this is going to be quite the challenge for Yoda. It’s not a matter of just him being the more powerful Jedi. It’s a bit trickier than that.”
via Yoda’s Past Will Finally Be Explored In New ‘Star Wars’ Comics