From every review I watched, the 3080 is a monster. Is it QUITE as much faster than a 2080ti as claimed? in MOST cases, YES. That's ignoring RTX. Those possible double-ram versions that accidentally showed up have me hopeful that maybe we'll see them pop up sooner than later. It's VERY unlikely they accidentally released info for cards a year away.
I'm not sure if I'll go for a 20gb version or not. It'll really depend on the price premium. It'd be nice, but the 10gb will likely be just fine for anything coming in the next few years.