An official Kaon from the IDW Decepticon Justice Division might be long odds.
I rather doubt we'll end up getting redone versions of all of the lesser-known characters like Aquablast, though I'd be happy to be proven wrong. There's just so many of them, and most of the obscure characters we have been getting recently end up being repaints/remolds. That's fine for cars/trucks/planes, but some of the Micromasters have pretty rare/unusual alt-modes, so it's more likely (IMO) that we'd see an Armada trilogy Jetfire homage before an Astro Squad Phaser and/or Blast Master.
Again, I hope I'm wrong - I'm always up for obscure character remolds/premolds. Better a character that hasn't has an update yet than Jazz #57 or Bumblebee #823 IMO.