At NYCC, a new Star Wars miniseries was revealed, it would focus on Obi-Wan and Anakin, and would show a part of the time they were still a full master and apprentice. Charles Soule spoke about what you can expect from the series, also as to why he picked this time period for the story:
"I've always loved Obi-Wan Kenobi. He's one of my all-time favorite characters in the entire "Star Wars" Saga. And Anakin too -- you take a step back, and look at this person's life -- so much potential for good, twisted into something monstrous by someone who understands that Anakin's yearning for rightness and order can be his greatest weakness. That's one hell of a story, and there are still many unexplored corners -- we haven't seen the whole tale, not by a long shot.
I'm also a huge fan of the Jedi Order, and we only really see it at its height in the Prequels -- if you really want to split hairs, it's only in "The Phantom Menace" that we see what the Jedi are capable of when they aren't being directly undermined by the subtle, malign influence of the Sith.
You look at Obi-Wan, a skilled, dedicated man who made a promise to his own dying master to train this incredibly powerful child -- I don't think he really understood what he was taking on at that point. I just think the whole master/student dynamic is fascinating, and we haven't really seen it that much. By the time "Attack of the Clones" hits, Anakin is pretty much trained up."