LOL!!! I know WTF! I had the same problem and I've been riding for 20 years and owned a boatload of crazy bindings.
I couldn't get an answer from anyone. Finally sent my Holograms back and got the Quantums. On the Quantums it was more obvious. It's old school "yank it". No release mechanism, no intelligent design, just pull the fuck out of it.
Sweet! The Quantums are really growing on me. I find something new I like about them everytime Im out. The last couple of days in the park I've found I can really use my ankles more to initiate spins. Less upper body rotary just another nice little surprise.
Where did you see the 2015 stuff? I'll ask around about the crossbow tech sounds cool, and I just found out a buddy is working for them.
You probably already have your answer, but I had the same issue on 2013 Calibers... Just yank and pull, bend the plastic a bit, then pop into the holes. Then just screw the bindings to your boards and away you go Also agree with the lack of instructions from Salomon.
Looks like the quantum and the new defender is getting that crossbow tech while the hologram and district still has the regular heel hoop.
The defender has a flex that's between the quantum and hologram.
The crossbow tech looks like just a stiffer heelhoop.
With the current quantum though, since the carbon highback is attached lower in the binding (kinda like switchback bindings), it actually provides some tip to tail resistance against the heel hoop. The soft heelhoop really functions more as attachment points for the ankle strap, letting it stretch more from tip to tail. So far it doesn't feel like it needs to be any stiffer tip to tail; otherwise you might as well just get normal bindings.
I'm going to see if the switchback highbacks fit the quantums. It'll be like owning the holograms and the quantums. That way you can use the carbon one for freeriding and the switchback one for park.