Power Leveling, at least at first, is going to be a bit difficult as everyone's going to be in the same boat...all starting out...so, there will be no one to PL.
However, if they keep AE as it was, or, at the very least, keep it in the game for the missions to be re-created, there was this one Fiery Aura Brute/Tank mission that kept your toon beneath level 8 (or something) and allowed you to PL yourself to 50. Some claimed they could do it in 5 hours...I don't think that was very realistic...but, it WAS pretty quick.
I would, most definitely, use that mission, or something similar, to get one of my Brutes or Tanks back up quickly. I liked to repeat the mission for influence. But, I'd get my old damage hogs back.
Then, I'd play my namesake (Empathy Defender) to 50...slowly...doing all the Task Forces and cool missions I've heard about to really immerse myself back into the game. I'd probably choose a new secondary, because I never cared for Psychic Blast...not sure if I'd go with Ice Blast or Dark Blast...any suggestions?
My game-play style was pure Empath. But I loved throwing in a hold or two...and I liked the holds that had strong visuals..like the giant ice block or Tenebrous Tentacles. I would do Earth Control, but the Empathy powers aren't as strong and I loved being really active Emping...not controlling.
I thought Plant/Bow Control sounded great for all the awesome holds and crowd control abilities.
I'd definitely re-roll and play (slowly) a new Plant/Storm and an Earth/Storm...and go through several of my Mastermind combinations...Thugs was most useful, I think, but Bots were still my favorites.
OH MAAAAN, I SO want to play now...