They just lopped off the little handle on the back of the main "pod"/cockpit section, that's been there since it's vintage days. Now it's just a nice, round and accurate cockpit. I believe the interior of the cockpit might've gotten a slight retooling or something to that effect as well.
But yeah, it sucks that the solar panels didn't get increased in size like we've all been expecting for the past couple of years. I heard that the revised cockpit is slightly different in color from the Interceptor, so exchanging the cockpit portions of the two fighters doesn't work quite as well as we had hoped and as had been rumored...Here's the link
at KBtoys.com where you can order this Tie Fighter for $30... There's usually a $5 off coupon for KB floating around the net, so do a Google search for it, and I'm sure you can turn one up!
Here's a picture of the resculpted cockpit back for you Chris, so you can see the difference: