Well, I wouldn't count on End Drain getting a significant bump. It's not very effective for a Defenders Electric Blast, I can't image that Controller's would get a massive debuff denied to Defenders. I, also, don't think we'll see a different secondary effect. That would be counter-intuitive to everything they've done with Electricity up to date. I'm guessing the damage scale will be identical to Ice Control. That being said, Electricity is pretty good with AoE powers.
I could see this:
I. Electric Fence (Immob, -End)
II. Tesla Cage/Shocking Bolt/Electric Shackles (Hold, -End)
III. Electrifying Fences (AoE Immob, -End)
IV. "Sleep" Chain Induction (Ranged Single Target Sleep, - End, +Special - Power May Arc to Other nearby opponents)
V. Lightning Field (Toggle PBAoE Minor Damage, -End)
VI. Lightning Clap (PBAoE Disorient, Knockback)
VII. Unnamed AoE Hold (AoE Hold, -End)
VIII. Short Circuit (PBAoE Morderate Energy Damage, -End, -Recovery)
IX. Gremlins (Melee Minor Energy Damage)
I also think that using the Lightning Rod placement type power would be an awesome visual effect for one of these powers.
Wont get Power Sink (as it's available to Dominators in their Epic pool) and wont get EM Pulse's -regen on the AoE Hold. Lightning Reflexes would be cool, but with the possibility of pairing it with Kinetics, I can't see it happening.
Maybe we'll see an Electric Controller Epic that has Power Sink, Charged Armor, Ball Lightning, Surge of Power, Thunderstrike, or Energize.