These were put up for pre-order last week, and the orders were supposed to start shipping a few days ago, but no confirmation yet on that. This picture collates all the minis in the release.
The boxes are:
Doom Train with Night Fright & Leech.
Crimson Oni with Foxxy Blade.
Green Serpent and 2 Ninjas; 4 heads, 2 bodies, 4 sets of arms - lots of possible combinations (128 depending on arm pairings?); Hero and villain options, and with the right Team selection, a Jade Cult Ninja Sensei option can be unlocked!
Shadow Mask with Tanuki.