Last year's commercial was posted on the UO YouTube channel on August 31st.
Yes. Here's a map, courtesy of Gambit on HNN (Robert the Blade = Afterlife):
As for the billboard, I'd be surprised if it's permanent/not a teaser. It has no mention of the event name whatsoever. Not even the website is included. Also, I'd be ecstatic if Resident Evil was dual-run. Maybe that's why they held back on announcing it. :shrug: