That is... very interesting. At least three actors have said the shows are six-hour long, so I guess Marvel Studios pre-established that time for all shows, but decided that maybe some of that screentime might be shared differently for each show. I guess that makes sense for WandaVision, if we stop to think about it. The sitcom episodes might have not required too much screentime, since sitcoms are usually shorter, so they saved that screentime for more episodes on the second part of the show. I think it can work.
I mean, SDCC Online is doing SOMETHING, because we know Marvel TV's Helstrom will have a panel there. While I do think it's entirely possible WandaVision will be delayed again, I also think it's possible that we might get some new promotional material. They did a teaser for TF&TWS/WV/Loki back in February, so they definitely have enough content for more promo now.