If you haven't been to the TNT website in a while, they have some new videos up for Leverage. One of them is the "Leverage Rewind", which they will be showing at 12:56 a.m. on Saturday morning and 11:56 a.m. on Sunday morning. There's a couple more videos about season 4 there as well, such as how they shot the new promo that has Tim Hutton walking through the scenes while everyone else is frozen.
If I remember right, last year they ran a marathon of all the season 2 episodes just before launching into season 3. Doesn't look like they will be doing that for season 4, though. But since we get new Leverage at 9pm on Sunday, maybe that isn't so bad. (Or just go out and by the season 3 DVD set and have your own marathon.) I'm looking forward to seeing the opener, since they spent two years of figuring out how to avoid showing Mount Hood in the background and this episode will take place on Mount Hood.