According to Igor's Lab, Nvidia did not feel a need to rush its Geforce RTX 3080 Ti to market, as while the RX 6000 series had 16GB of VRAM, it did not give those cards any significant performance advantage in reviews, thus RTX 3080 Ti can wait for the next year and get its proper launch in mid-February, 2021.
As rumored earlier, the Geforce RTX 3080 Ti is expected to come with 20GB of GDDR6X memory and should be coming with a $999 price tag, countering AMD's Radeon RX 6900 XT.
Possible 12GB RTX 3060 coming in January 2021
Nvidia also plans to launch the Geforce RTX 3060 in January next year, which should counter AMD's rumored RX 6700 XT, said to pack 12GB of VRAM. The rumor suggests that the RTX 3060 could come in both 6GB and 12GB versions, but so far, details on these cards are scarce.