According to this leak, which should be taken with a grain of salt (or you can take ten grains, one for each core), the Helio X30 will feature four Cortex-A72 cores for the tasks that require power. Maximum clock speed will be 2.5GHz. There will be two Cortex-A72 cores clocked at 2.0GHz maximum, two Cortex-A53 cores clocked at 1.5GHz, and two of the just introduced Cortex-A35 cores running no faster than 1GHz.
We have yet to see any handset hit the market with the MediaTek MT-6797 SoC, the Helio X20 chip that should pop up in some 2016 flagship handsets. Interestingly, an earlier leak pertaining to the Helio X30 back in August, correctly called for the quad-cluster design that today's rumor has presented us with. If the rest of the rumored specs from August are true, the Helio X30 will support LPDDR4 RAM. And the Helio X30 will supposedly carry ARM's latest and greatest graphics processor in the Mali-T880.
Thanks for the tip!
source: MyDrivers (translated) via GizmoChina