If you already own them you're in luck. If you're a new player reading this and don't own any yet, then this thread might be pointless for next edition since people won't be buying the models!
But seriouly, these guys were great when the book came out, but from HE and beyond I think they deserve a boost. They aren't quite living up to what the newer books get for their points. Don't get me wrong they're almost there, but they need a bit of a tweak. They compete for the ever coveted empire special slots, that alone is a big strike against them.
My suggested fix so far is them getting a 50 point magic banner option without a points increase for it. I think everyone can agree on that. (also griffon banner going back to 50 points, but that's a topic for a different thread)
I'm not sure what else to give them to both keep their character and also make them a bit better without putting them over the top. I don't think they are in line for a price change, maybe 1 point less max. Maybe something like base S4, or re-roll panic due to their grizzled vet status and discipline...
Just brainstorming here. Any other ideas?