Ive developed a bit of a system that tells me when new Canon cameras will begin to ship. All indicators are saying that the first copies will start appearing in the next 2-3 weeks at the latest, and then become readily available everywhere in about 4-5.
My advice to longtime Canon 7D owners looking to upgrade: SELL THEM NOW, because once the 70D comes out, it will essentially replace the 7D.
If you have been wanting a 7D, its a great time to pick up a lightly used copy, expect to spend $700-800 for one in good condition. I should have 2 more available shortly for those who are interested, both at $700. If you are interested in them let me know and Ill be in touch with you shortly.