Well, there may be a lot of rumours in this forum that American is considering unveiling a new livery but I haven't heard anything about it. I don't think that they are going to change their livery any time soon. What is changing is the interiors. The current scheme looks good like that, don't you think? Yes sure some of you may be tired of seeing the solid blue/white/red solid line but I think they should stay as they are.
If they ever change their livery, they may modify the cheatline and make it a little softer and write the word "American" in a larger size (like Pan Am did in the 80's remember?) but they'll always keep a bare metal fuselage, I think. They will always keep that because they want to save as much weight as possible on the aircraft, that's their policy. The cheatline will still be red, white and blue although a bit thinner like I explained, the word "American" will still be written in red and the AA logo will have a redesigned eagle. The non metallic parts will of course be painted in light gray like they are doing right now, so will the engine nacelles. Of course, there'll still be the US flag on the top of the tail.
I don't think they will paint the fuselage but if they ever do it, this is what they'll do: they'll paint the top part of the fuselage in either light blue or shiny light gray, the bottom part of the fuselage would still be bare metal and the cheatline which would be as thin as that of United (you know the thin orange, red and blue cheatline between the gray and the blue) would be the separation between the paint and the bare metal. That's my idea of a new corporate image, with the redesigned eagle. That would look great wouldn't it? The future will tell.
PS: The AA 757 with the orange lightning scheme from the 50's, I saw it at Chicago O'Hare three weeks ago on my last trip.