I called Sean at Peninsula Bike Works to have him order a Yuba Mundo v4 for me, then just saw this video and had to call him back. The v5 has been announced...
It has the features I wanted in the v4 (and more) and would have had to
upgrade. Cromo frame that is 5 pounds lighter, 1-1/2" headtube, lock
tabs, Yepp EasyFit mounts, 10mm axle dropouts, hydraulic disc brakes,
maybe a cassette instead of a freewheel, and Shimano components.
Now I just have to figure out when it will be available. Unfortunately, Yuba doesn't have a phone number available so I'll drop them an email for some more info.
UPDATE 1: I found out from Ted at Yuba that the v5 will be available on August 17th. I will have mine in hand shortly thereafter!
UPDATE 2: Mine is on order! They are currently in port, waiting to be delivered!