They're starting to trickle out although I don't know if any stores have them in stock yet. So far just some cheaper models are listed on Panasonic's Canadian site but the Americans have the G10 already for sale. The top row
here are new models.
The S1 is replacing the Z80 but with much better black levels. The G10 is replacing the Z85 but is THX certified. Per usual we'll get gouged in comparison to American prices.