Didn't think I'd say this, but I kinda miss my HE400s. They just really improved after I bent the headband and got my Lyr. My HD600s aren't bad at all, but after hearing the epic bass response and clarity of the HE400s, I actually do kinda miss them! I will be rather excited for the new pair. I hope they get them out quickly.
I miss mine as well, let me know how your shipping reimbursement turns out. I just put the shipping label receipt in the box before I shipped it out figuring they would see the receipt and issue it when they received it; I kept a pdf copy also in case I need to e-mail them instead.