These tanks were shown on a future vertion of the tech tree as American premium tanks; but as the Japanese tree is coming soon they will probably be Japanese premium tanks.
Type 95 Ha-Go[]
Japanese, Premium, Tier II, Light Tank
Already in the game.
Type 97 Shinhoto Chi-Ha[]
Japanese, Premium, Tier III, Medium Tank
Wikipedia article here: http://en.wikipedia.org/wiki/Type_97_ShinHoTo_Chi-Ha
Type 5 Chi-Ri[]
Japanese, Tier VII, Medium Tank
This tank appeared as a regular tank.