Jake, I don't think they have updated their web site. Although the newer rail is more usable, I prefer the looks of the older style. It's more romantic. The only differences I can see between the new vs old (I prefer to say "original") is;
1. the rails (duh!)
2. the (for lack of better terminology) scalloping were the web of your hand fits while holding the pistol. It does not dip down as much in the new style frame...
3. Larger roll pins in the newer frame.
4. the slide release is recessed in the new frame, ergo, more snag resistant.
5. beefier, bolder slide grip grooves...
6. The trigger gaurd is rounded and no more hump in the newer style frame...
I think that's it...
Look for yourself: