I don't know yet if they are filming inside or outside - I'll have to walk down there this afternoon and see what I can see. Apparently right now they are just setting up the trailers and whatnot. I know when Hiccups filmed there (Canadian sitcom, with the actress who played Becky in it, sadly not renewed for a 3rd year) they filmed inside after school was out so you couldn't actually see anything.
It's too bad Supernatural isn't set in Vancouver, there's a great view of the city from there. Anyway, I will update you all later...of course, most of you know my aversion to stalking, so I'm not guaranteeing any pictures/hanging-around-for-hours. The most I can manage is usually a slow "walk-by" with perhaps a two to five minute linger...and then I usually get that squicky feeling in my chest and have to leave. Perhaps if I'm brave enough I'll try to talk to a PA and ask some questions. No promises though. I am a delicate flower. :P
(Also, if that paparazzi guy is there, I'm not hanging around at all...I can't stand that guy.)
ETA: Did my first walk-by. It looks like they are still setting things up. It also looks like they'll probably be filming indoors - so there won't be much to see anyway. Jensen and Jared's trailers were there though - parked side by side. It looks like they have satellite TV too! How nice for them. It's a really beautiful day.
This happens to be my favourite view of Vancouver (and one of the reasons that I think they are filming inside):
You can see Jensen and Jared's trailers in amongst the crew trucks.
It's also a good spot to watch the fireworks on Canada Day. Just FYI.
I'll walk by again this evening.