I believe 08/09 is the first model run where Tyrolia renamed their "Mojo" line of bindings to "Peak" and made some other changes (looks like Head retains the Mojo nomer for their version of these bindings). In addition to the name change, there were a few other tweaks.
For the Peak 12, stand height is 19mm. Other than a flatter toe mount (no plastic baseplate) with a teflon pad instead of the belt-style AFD, this binding seems very similar to the LD-12. Differences include the rear cocking lever on the heel and minor cosmetics. The Peak 12 has the side-pivoting diagonal heel and will use standard Tyrolia brakes of the past few years that were available for the LD-12, Mojo, etc. The Peak 12 happens to ship with a 97mm brake, a little wider than previous Mojos.
The Peak 15 has a 17mm stand height. The "Aero" toe piece seems similar to last years Mojo from what I remember. The heel piece, however, appears to be completely different -- this one is called the "Race" heel and does not have the pivoting diagonal feature. One aspect of the new heel is that a new brake style is required, and older LD/Mojo style brakes can't be used. The Peak 15 also ships with a 97mm brake.
What caught my eye is the heel piece of the Peak 15. This has got to be one of the beefiest heel pieces I have ever seen:
First thing to notice is that the main body of the heel piece is entirely metal -- heavy gauge, stamped, plated steel. It is unbelievably stout. The heel track is all metal, including the rear screw mounts (in contrast, rear screws go through the plastic base plate in the Peak 12 and only hug the rear track). This has got to create one solid connection to the ski.
The Peak 15's hinge-pin is attached to the heel block and cocking lever through a gear-shaped stainless steel bushing, which is another impressive feature. The Peak 12 appears to mimic this feature, but it's only a silver decal in that case -- not the real deal.
Overall, the Peak 15 (and it's 18-DIN brother) is probably the beefiest binding I have seen. It's a tad heavy, but inline with the solid construction. When you look at the Peak 12 (and LD 12) side by side with the Peak 15, there is no comparison -- the 15 is significantly more solid and built like a tank. The combination of the non-diagonal heel and the metal body and track ought to make the heel piece extremely rigid and slop free.
I don't have a ski to put these on yet, but I am looking forward to it. I think the Peak 15 will make an excellent binding for a wide bomber ski which is driven aggressively and hammered on. I think the ski will fail long before that heel piece ever gives up.
If you're in need of bindings, keep an eye on Tramdock in case these pop up again.