As far as I know, these are the first Japanese toys from Pacific Rim to be released, although, really, they're more "collectibles" than toys.
These are 3.75" Gashapon-- or capsule toys. You know, like the kind you used to get out of a bubblegum machine when you were a kid. Well, except that these are much more high end than the crap we used to buy for a quarter.
I don't see these being released stateside officially, so you'll have to either find these on eBay or from an import dealer somewhere online.
I'm not sure why they changed Knifehead's design, though. They have him like these hammer head shark eyes on stalks. Kinda weird...
These are set to be released in Japan in November.