First up, it's rumored that NVIDIA has three variants of the PG132 reference board. This board is expected to use the GA102 GPU, which is the chip that will reportedly be used for everything from RTX 3080 to RTX TITAN Ampere. The PG133 reference board reportedly also uses this chip, but this irregularly-shaped PCB is allegedly only for the NVIDIA Founders Edition.
ChipHell and WCCF Tech claim there will be an Ampere-based card with 20GB video memory, while German tech site Igor's LAB claims the PG132 board will have 10GB (RTX 3080), 11GB (RTX 3080 Ti/SUPER), and 24GB (RTX 3090 Ti/SUPER) configurations. There is some contradicting information here, we should find out in a couple of weeks which info is correct.
WCCF Tech claims the first cards will launch around mid-September, with more to follow in the second half of September and the first half of October. GamersNexus on the other hand claims NVIDIA has picked September 9 as the date for its first Ampere announcement. All we can conclude at this moment is that there's a lot of confusion but that should clear up in September.