I did know a few things here/there, hard to get away from a prominent fandom like Homestuck here. I listed some things when I first started Homestuck (can be found with the “homestart” tag). But I knew that there were 4 kids, they played a game and the world imploded. Other than that were like bits and pieces of “the dad has no face and becomes John’s son (???)”, troll’s exist in Act 4 and have a blood caste system and everyone loves Kitkat or kacarot or whoever that guy is. And the multiverse in on a toad. I think. Most of the info I got was me scrolling pinterest.
As for expectations, honestly I thought it was a game. Or at least more interactive. But it has gotten really interactive with the flashes and music. I think I was expecting more battle oriented things, but Hussie delivered on mystery and intrigue. Which I am pleased