Rockchip are showing off their RK3066 chip tablets @ HK Fair. This ARM chip will also be 40nm like 8726-MX.
In one of the pictures, you can see the RK3066 clocked @ 1.6GHz!!! =)
Not only are they coming out with 2 core CPUs but the clock speeds have jumped by 500-600MHz too. This will give a *major* CPU performance jump. This is why people are best to hold off buying *expensive* tablets until these come out. At earliest, 1-2 months for MX and 3-4 months for RK3066.
The CPU performance difference will be major. As for GPU performance, hard to say. A10 & 8726-M1/M3 appear to have dual core Mali400 GPU. So, difference between A10 & 8726-MX in GPU benches maybe very small and minor. ie, maybe get similar gpu bench results but 8726-MX will run everything very smoothly.
PS, this is the same to what happened with iPad1 (single core, Cortex A8) to iPad2 (dual core, Cortex A9). The 8726-MX should be close to or better than iPad2 GPU performance. The RK3066 should pass iPad2 and hopefully reach iPad3 GPU performance. At least the performance gap between iPad2 & Tegra3 tablets will now become very small with these new dual core A9 chips coming out.