I have a 6/6 Mach that is about 10-12 years old. Good unit, but the new Odyssey looks sweet. Saw it online yesterday and wondered the same thing: when will the Mach get an update. My suspicion is that the Mach will have the same upgrades plus a few more bells and whistles.
What I didn't like on the new odyssey is the height of the pallets off of the pallet arm. Why didn't they just make/use an Action M&R pallet adapter to keep it low. Thinking that doing sleeves/legs might be problematic getting it to go all the way through.
I've been trying to rig up a way to get aluminum pallets on my workhorse brackets....
If I were you, the new odyssey looks great. If you don't need a 6/6 all heads down, go for it. Registration should be a snap with the bearing guides.
BTW - I run a Mach 6/6, Brown 3609 dyer, 23x31" exposure unit, and washout booth in my garage.