The dual extruder is still up in the air as far as I can tell. Power supply problems, software problems, etc.... been waiting for dual myself. UM3 release date ?? wouldn't hold out for that.
when picking out a printer this is a good question to ask yourself.
Do I want to work WITH my printer? (aka buy a good one that works out the of box)
Or do I want to work ON my printer? (aka buy a kit, rebuild an old one, need good geek skills)
Ultimaker is like buying apple products. $$$ Mine worked right out of box happy with purchase. Lot of good deals on machines out there.