I just got an email by Adorama saying they are fulfilling all Canon G1 X back orders starting by today (click here for preorder). They have also a limited number on stock. Hurry up!
For pre-ordering in the USA check the following links: Amazon US (click here) free shipping, Adorama (click here) free shipping, B&H (click here) free shipping, J&R (click here). Readers from outside the US can start to check the following links to see if pre-ordering is possible: Amazon, B&H, Adorama, Canon USA, J&R, Digitalrev, eBay, rent it at Borrow Lenses. The G1 X is now sold on Ebay too (check these offers with the necessary awareness).