The good news is that until you decide what lenses you want to get for a Sony system, all of your Canon lenses will work fine in the meantime with just the addition of an adapter. That way, you can make the change over at your own pace and not feel frustrated that you have a camera but no lens to use with it.
Yup. Believe me, that's at the forefront of my mind.
I'd really like to try it out with a native lens though, because I really want to see how well the native AF works and whether the FE lenses are worth the rather high prices Sony's charging for them.
My Canon lenses will be very nice, but down the road, assuming I am happy with the AF for the most part, I'd prefer to swap out my EF 16-35L/4 ISand my 70-200L/4 IS for the Sony variety if they're nearly as good as their Canon brethren.