DR MattH asked a question about this week's ALIAS which I did not get a chance to watch on Wednesday.
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You asked about Jack's playing the piano at the end of the show.
I'm not sure exactly what it meant, except that his old friend (the french ambassador's wife) asked if he still played. And he made a point to tell her that he had given it up. I'm assuming it meant something to him/them in the past.
I'm also thinking that he has either been playing this whole time. Or perhaps he really had given it up and her reminding him of it got him to do so again.
Okay now i think i've confused us both!
but what about that preview for next week?

My gosh they really gave away a lot!
I don't get why they showed it that way. I would have thought they might have made it seem like a certain character might come back. But certainly not show him!