The 16GB and 20GB variants of the RTX 3070 and 3080, respectively have been spotted in Gigabyte’s Ampere database (via VCZ). It’s actually the same site from where you redeem the Watch Dogs Legion code that this info has been leaked from. The database includes 16 models of the RTX 3070 and 20GB models of the RTX 3080.
The 16GB and 20GB variants feature an S instead of a Ti suffix, indicating that NVIDIA may market them as such. The rest of the specifications of these cards are expected to be identical to the vanilla models, and it’s only the VRAM that will be doubled.