Until now all Lumix G cameras started to be shipped in Japan first and than (slowly) spread over the rest of the world. It looks like the Panasonic management decided to go the exact opposite way around. Amazon Japan ships the camera on Dec 13th but you can already get it in EU and US:
in US preorders are now shipping at Amazon, Adorama, BHphoto, Panasonic store and Samys.
In EU these stores are having the GH3 in Stock right now: Wexphotographic UK, Amazon UK, Photoexpress UK, Wex Germany, Technikdirekt (DE), Webdistirbution FR, FotoHansKeuzekamp(NL).
That may be some kind of make it good action from Panasonic for all the time we had to wait on the previous G cameras shipments
The battery is now available for preorder at BHphoto (Click here) and in Stock and shipping at Photoexpress UK. The UK store is also the only one shipping the vertical grip (Click here).
12-35mm X price drop at Amazon US:
There is still no GH3 kit order option in US. Meantime the 12-35mm X lens got a new $100 price drop via Amazon itself (Click here). Third party reseller Panacam sells even for even less via Amazon (Click here). One more little thing: Some nice deals on smaller accessories at Amazon Gold Box.
P.S.: All current GH3 auctions can be monitored on eBay (via Slidoo).