http://www.x2digitalwireless.com/
 
They're back, they're in the shops now, I've got one and it works very very well. There is a wiring option for full bandwidth output as opposed 'instrument optimised (i.e. lower hi freq. cut off), so Alembic players may want to be aware of this. No mods required for this, just the appropriate cable.

I just got my X2 wireless today.  I'm going to build a power supply for Series II so I can go wireless now.  Ron Wickersham was cool enough to tell me how to make my own.  It's pretty simple actually.
 
As soon as I do it, I'll give everyone an update.

Cool. I love my X2. Keep us informed of the pack as it develops.