User blog comment:Feeling-Chalant/Bloodlines Photos (Bart, Heatwave, Barry, and WALLY?!)/@comment-3118271-20120601201850/@comment-24.43.26.122-20120602051625

My guess for this episode is that Wally temporally comes out of retirement to help Barry and Bart fight against Heatwave. But at the end, he'll retire again while Impulse becomes Barry's new sidekick and the newest member of the Team.