I played with this camera briefly at Best Buy a few days ago.. I was SERIOUSLY impressed with it.
The first thing I noticed was how fast and quiet the AF was on the lens. So fast that I thought the aperture was at f11 or something. Incredibly fast. The kit lens (18-135mm I believe) was REALLY good. Definitely more than enough for a beginner and a decent inclusion for a kit lens.
I REALLY was diggin' the touch-screen. I had no idea I would like it as much. While not faster than using dials, there is certainly a convenience factor that is worthwhile. I found it incredibly easy to navigate through the menu using the touch screen.
What I didn't notice was the plastic, smaller body. Which is a great thing. It's why I chose my 50D over the 60D. And while I think the Rebels are GREAT cameras. Just too small even for my medium sized hands to use effectively. So the 70D being even smaller than the 60D but feeling comfortable? That's amazing. And it doesn't have the cheap'sh feel of a Rebel. Despite having a plastic body.
Gosh, this is SUCH a fantastic camera! The ONLY problem I have with the camera is that it does not have a replaceable focus screen. So the screens would be optimized for faster glass. Even though I use fast primes though I rarely go beyond f2.8. So this might not be a deal breaker.
For the amateur or aspiring professional, it's hard to go wrong with this camera. Put a metal body and dual CF slots and you'd have a damn fine pro camera....