As I said in the other thread, FFG's demo's made this an obvious, and strong, combo. They have toned down Gandalf though I have heard.
The main issue with the combo is that, barring any easy way to get cards out of the discard pile, it is a combo. It might not go off ever, with you have three Gandalf's but no Sneaks in hand and not really wanting to 'hard play' him onto the board.
Pretty strong though. The last part of the combo is Valiant Sacrifice which then nets you MORE card advantage.
I like Leadership a lot right now. Aragorn looks really good, I like him with Theodred. Steward of Gondor seems like pretty amazing resource generation. I assume from the preview of them they will have some good Allies. With only the cards spoiled, I will probably run them with Eowyn. But, who knows!
And, yes, making posts complaining about internet posts ('it's too early!') is kind of silly. No would would post anything if we couldn't speculate and get excited about things using the early previews.