Interesting. Why do you say no one knew about it? From my perspective (northern CA) everyone knew about it. Why do you think more people 'know' this year?
Last year, I think it's possible that the casual fan (whom I would bet are the majority of attendees at WonderCon) might not have been "looking" for it to be in Anaheim, if that makes sense. For me personally, I live in San Diego and had never been to WonderCon before last year. I've been going to Comic-Con for well over a decade, and have known about WonderCon's existence, but always associated it with San Francisco. I knew there were construction issues, but a year/year-and-a-half ago I still assumed it was a No CA thing. Once I started paying attention more to CCI on social media (here, twitter, facebook pages) last year, I was a little surprised to see the "there's construction, it won't be done in time so WonderCon will be in Anaheim" announcement. I bought a pass (I think I bought it sometime in late February, maybe early March), went to WonderCon, and had a blast!
This year, now that WonderCon has been in Anaheim, I think more people will be looking for it to be in Anaheim. Maybe Con-goers in So CA last year just thought of WonderCon as a No CA thing, and are now anxiously awaiting it to come back to Anaheim. I know that's the case with me.