Ross confirmed that the 25% discount is valid for everyone, and will stack on top of your existing sub in the comments on this blog post.
Didn't the guy say during the conference it was for new subscribers only? I'd be very happy if it weren't.
I assume that 25% discount will just add the time on to the end of my existing sub, so even though it doesn't expire until next March, I'll probably still pay up while it's cheap.
Just a month after I signed up