Yeah Disney is purging everything they can find. Here is a still functioning link to the trailer if you are interested though
https://streamable.com/1pjoqb
I did a bit of digging and there seems to be some news for what Wandas role is in that What If trailer. All of this seems to come from someone who actually attended SDCC.
"a fellow redditor lower down in this thread was at comic con and confirmed that she does show up at the end, along with nick fury, as set up for marvel 1602. however, they also said she didn't give off any villainous vibes at all, and we know from what they said at the panel that she's supposedly gonna be one of the heroes of this season saving the multiverse."
"I caught the episode they screened at the animation panel and it seemed like a huge improvement over the first season, but it was only one episode so I don't wanna get my hopes up yet. This trailer was pretty cool but it really doesn't seem to feature footage from a huge collection of episodes. They also hinted that Marvel 1602 will be the crossover climax this season."
"do you mind sharing what is the supposed big twist at the end of the episode? some trades mentioned something about wanda showing up but that's about as detailed as it got."
"That was the 1602 tease. The Wanda from that Earth appears during the ending with Nick Fury."