Slated for May release. Two boxings, with different gun crews. I don't know if these have been seen here before.
http://www.1999.co.jp/eng/image/10199395a/20/1
http://www.1999.co.jp/eng/image/10199396a/20/1
And some infantry, currently available.
http://www.1999.co.jp/eng/image/10199393b2/30/2

These figures have been hard to find online. I should be getting mine in the next couple of weeks.