"I'm just doing little bits and pieces for other magazines right now"

Jhonen Vasquez is likely describing his current work as a freelance writer or illustrator. He is not currently working on a major project, but rather is doing smaller tasks for numerous magazines. This might suggest that he is writing short articles, creating illustrations, or both. It could also mean that he is working on numerous jobs simultaneously, but none of them are particularly large or long-term. This could be a sign that he remains in between significant tasks, or that he is taking a break from larger jobs to concentrate on smaller ones. Whatever the case, it is clear that Jhonen Vasquez is currently working on smaller tasks for different publications.