Interesting... just left the KalaBrand.com website and looked for their marketing info on their U Bass... They don't claim it to be an 'ukulele, and under their product categories, under 'Ukulele, the "bass" isn't listed. Instead it's a category of its' own.
"The U•BASS® by Kala is the Original, short-scale bass developed and brought to the market in 2009. Used by bass artists around the world - live and in the studio. The portable U•BASS® makes a great addition to any bassist’s arsenal. Recognized as one of the music industry’s most innovative products, the U•BASS® has received multiple BEST IN SHOW awards from publishers, retail leaders and review websites." blah blah blah...