I would rather be run over by a bus then believe that Canon would not improve on the 60D, especially after the 60Da. I saw that as a life-lengthener to the 60D, even if it's only real changes are the astrophotography adjustments.
Canon has lasted this long and I highly doubt that they are naïve enough to not know they better bring something better to the table for us 60D folks than just a few wallet warrior options. Sure, WiFi & GPS have there places in some peoples work/photography styles, but for those of us that didn't get the 60D at the current low pricing bought that camera because it was all-around better than the Rebel line of cameras (the swivel screen was just a bonus (for the most part anyway.)
With the T4i getting GPS and touchscreen and the 6D getting WiFi & GPS, I believe Canon is testing the waters to see what us lower-middle class (in range of cameras, not in actual income) DSLR buyers desire more, toys or IQ.
I honestly wouldn't care if the 70D, or whatever it's name will be, looked identical to the 60D as long as they improved on noise across the ISO range & maybe give it STM ability.
Also, if you happen to be listening Canon, please get rid of the frickin smooshy directional pad and let us have the joystick for AF!