A new hobby store limited prize item set for SD Sangokuden plamo series it seems. A total of 4 different add-on sets to be collected.
Combine the armors from set 1 and 2 to form a cart.
Combine all 4 sets to form an armored module.
The different armors can also be mounted on a single horse unit.
Hakugin Ryuseiba shown is not included.
The add-on sets can be obtained from hobby stores with this special offer starting June 28th - one set for each SD Sangokuden kit purchased.
Images are from Bandai China Crew Blog.