I am pleasantly surprised with the sets, I didn't think I'd like them, what with them being specializations on a Jack of All Trades class. But I guess I'll have to wait till I play with the changes to give a final verdict. But they sound promising. Hopefully the power cost reduction is significant.
One concern: Our Corruption removal skill is a 3rd tier skill,
Improved Blade of Elendil (so we might even need to trait it to get the Corruption removal), where other classes seem to have them as first tier. So without knowing exactly what Corruptions do other than "you'll want to remove them", the soloing Captain is going to be stuck suffering through these mob buffs/player debuffs for 3 hits before we get a chance to remove one... if our Cry isn't resisted. ... What's the deal with that?
A question: Muster Courage is getting a self-heal with a trait but prevents a Herald. Is the heal associated with it roughly the same as the Lend Will heal from the Herald? Or is it greater or lesser (since it has half the Lend Will CD timer)? Is it a direct heal or a HoT?
And like the other poster, I also agree that having a Threat generating skill as a On-Defeat skill seems kind of silly.
Minstrel shouting: Get these guys off me!
Captain: I need to kill something first!

It's fine when there's a Normal level mob in the group, or you have a DPS group that can burn an elite down in a few seconds, but if you've got a group of elites it could be a little bit before you'll be able to use your On-Defeat.
From the
Lead the Charge set.
Might be nit picky, but considering the only picture we've (I've) seen of a Captain Legendary weapon was a one-handed Mace... If you're not going with
Lead the Charge, will you be expected to be using other weapons without the +Threat? A one-hand and a shield perhaps?
Boo if so.
Overall, pretty interesting... But I'll still have to wait and see for myself
