It's been confirmed that Evan Peters will appear in WandaVision as an unknown character, and since Wanda is exploring her reality-altering abilities for the first time in this series, it's practically all but confirmed he'll be playing his version of Quicksilver now that Marvel Studios have the rights.
In trying to make her life perfect, Wanda will of course bring back Vision, but what about Pietro? I think she'll try to get him back too, but for whatever reason (maybe she tries him before Vision and has less control) she reaches into the multiverse and pulls out PETER Maximoff from Fox's X-Men.
Given that he's been announced this early, it's likely he has more than just a cameo, and maybe they interact for an episode or two as she tries to get a hold on her powers, and if she can get Vision back, I bet she can get her brother back, meaning we'll finally get to see Aaron Taylor-Johnson and Evan Peters' Quicksilvers meet, maybe even have a race! For Marvel to pass up on allowing these two very different versions of the same character meet would be a HUGE missed opportunity.
Thoughts? Too far-fetched? Likely? Your own theories?