The RPM 3.3 arms have been out at least since August. I converted my emaxx to the 3.3 arms, steering knuckles, and sliders back then and I think they were out for a good month or so before that.
http://www.rc-monster.com/forum/showthread.php?t=3588
Heres the thread. It actually calls the part number list that you need to do the 3.3 slider/arm/steering knuckle conversion somewhere in it. With the RMP arms and the 3.3 sliders I have been running trouble free ever since.
Another cool benefit of the 3.3 arm/steering knuckle/slider conversion is that it gets you another 1" of width vs the 2.5 knuckles.