The old: Everything other than what is stated below
The New: Frame, Headset.
So far, all I've had time for has been a ride yesterday (probably 8-10 miles of road with a bit of hucking) and today I played around for around an hour on the BMX track. My first impression is that the quality over all is fairly high on the frame, though the paint is a bit sloppy. The way it handles is quite amazing IMO. Stuff that I had a hard time clearing was suddenly easy. Mid-air handling is fairly confidence inspiring, and the small tricks that I could do on the old C'dale are suddenly easy (whips/bar turns). I was able to clear everything just as well, if not better than 8 or so BMXers there. Not had a chance to go to any true trails or good urban spots, but I did do a 3-3.5 foot drop to flat and the frame felt fine. Finally, there is the issue of manualing. On the old frame, I could maybe manual a parking spot (across the narrow way) on one wheel at 15mph. Now I can clear that same spot manualing at around 5 mph. I can also hold the bike on the rear wheel (without bouncing or pedaling) for a few seconds. Overall it just feels way snappier, yet somehow more stable. With the seat all the way up, it feels like I'm about the same distance from the handle bars as on my old bike due to how slack the seat tube is. In the saddle climbing might not be so hot, but it still climbs well, and now I can wheelie at any speed just by pulling up slightly and pedaling I'm very impressed for the money.
Edit: No, I'm not that dumb or blind. I do realize that the neon zip ties look really bad. They were what I had within a 10 foot walk of where I was building up the bike. I'm gong to switch to black here eventually.