The frame is still the same. The difference is in the rear shock. Yeti designed the bike to be as versatile as possible, single or double ring.....single or dual crown fork. They did a great job making a bike that could be set up for anything. The frame comes with a 8.5 x 2.5 Fox DHX 5.0 Coil, this set up gives you the option of 7.1 or 6.4" of travel. With a dual crown on the front it is ready for DH and with a single crown the angles are good for climbing and genaral riding. As I already have dedicated XC and DH bikes I decided to put a single crown on for FR and stuff. The problem was the head angle was a bit steep for comfortably going big. I started doing the math on a shorter eye to eye rear shock and it seemed like it would work, as no one had done this, at Yeti or otherwise, I just bought a Fox Van to see if it could work. 1/2" shorter eye to eye as well as stroke puts the end of the travel in the same spot it would be, reducing the head angle, travel, and bb height all at once. The bike now gets just under 6" travel in the 7.1" setting, weight is 34 lbs. w/2.35 minions and xc tubes(I have a set of 729's if climbing isnt nessecary) the bb height is 12.75 and the head angle is 66 degrees. The bb may be a bit low to some but it is still higher at the end of the stroke than an Ironhorse Sunday. I cant tell you how much I love this bike now, I can climb it up with ease and hit the biggest stuff on the way down. Im not saying it will replace your dh rig but it is the best mid travel option I have found that has in uninterupted seat tube. I am 6'6" and could never get my seat high enough to climb on other bikes while being able to get it low enough for decending . Feel free to send questions, I am talking to yeti about offering this as an option from the factory.
I did a bunch of work to it last season, so I think she's all set for '07. 
Mine's an '04 with the 5th element.
