I.nfraR.ed posted yesterday on the main CyanogenMod on MTK devices thread:
Do you see anyone working on CM for 6589? Most of the people moved to other chipsets.
Maybe chrmhoffmann and DerTeufel are still working on this, but I don't know anyone else who has not moved to newer device.
I have moved to Redmi Note 2.
For lollipop there's no mt6589 source and although it might be possible, it would be enormous amount of work. I don't have so much free time and have a full-time job after all.
I can't leave my regular job just to work on side projects.
So, no...unless someone else is on to development for Lenovo A820/A830, then don't expect fully working CM or ROMs based on Android 5+.
If for some reason I leave my regular job and have some "free" months, then I will be able to work on this project, because I still have my A820 with me. Not likely to happen.
My KK kernel is public, so anyone can continue from where I left.
That doesn't mean it's not possible, however; simply unlikely.