So far there are no much info than it will be on 28 nm TSMC process and will be very power efficient. If we make analogy with A20 and A23/A33 the A83T will be lower cost feature cut version of A80.
The 8 cores will run up to 2Ghz! They name the architecture big.LITTLE but with 8 Cortex-A7 cores it should be more little.LITTLE 🙂
The question is how many applications will use all 8-cores? We all know the many-core is more sale buzzword than real performance improvement for most of the daily use cases.
At least in PC world 2 core at higher frequency will feel faster than 4 core at lower frequency for most of daily work and 4-core benefit will be seen just in some software products which really use the 4 cores.
As always software is way behind the hardware development.