Nvidia’s GeForce RTX 3080 graphics card will be graced with a second variant that doubles the video RAM from 10GB to 20GB, if the rumor mill is to be believed.

Videocardz claims that it has multiple sources asserting that this is the case, and backs this up with a further hint from Nvidia itself in the form of an Ampere whitepaper from the GPU maker.
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https://www.techradar.com/news/nvidia-rtx-3080-20gb-rumor-suggests-maybe-you-shouldnt-rush-to-buy-one-of-the-gpus-anyway