This appeared to go up very quietly in the last 24 hours or so, but Adult Swim Video
has launched 'Gold' episodes, which are full-length episodes you can view in HD. The caveat here is that you need to currently subscribe to one of their partner providers to watch the video. So if you subscribe to AT&T U-Verse, Comcast, Cox, Dish Network, DirecTV, SuddenLink or Verizon for cable TV then you can watch Gold episodes! Just sign in with your account thingy. Currently there are four Venture Bros. episodes
up. There's no additional catch beyond needing to subscribe to one of those services, and there are still the usual number of normal-quality episodes up, though they're different than the Gold ones. If you have any more questions, Adult Swim put up some frequently asked questions
that may help.