Khan looked exactly the same to me. I didn't really notice any improvements at all to be honest. He made all the same mistakes where he just flurries with shots and leaves himself wide open. Just this time he was up against a smaller and not very good (but tough) guy. If he was against a Maidana, Peterson or Garcia (hell maybe even Prescott still) I think Khan would've lost last night.
But it was his first fight back since a big KO loss and he's only had one training camp with Virgil Hunter. So perhaps there's still time to iron out the flaws but I'm not convinced.
Unfortunately I think he'll lose badly again within the next 2 or 3 fights (unless he's kept away from the top competition which I doubt).