the Freescale quadcore is a bit dissapointing specially its GPU Vivante. I think that JXd just made a strategy. they have just released the mono core s5300, so if they do the same with s5600, nobody will buy s5300, so maybe after a a couple of months or so, they will decide to release s5600B, but ot is just a guess. Of course would be nice to include RK3066 or an Exynos, but I would be quite surprised they did. They never used Rockchip before, all the previous non-gaming tablet by JXD has been amlogic or allwinner. Bujt would be nice they changed some parts of hardware.
At least with the s7300B we can get a general idea about how these new system by JXD will work.