WTB added third 27plus tire, the Trail Boss 3.0 with Dual DNA rubber. On sale starting in October 2015 for $68 MSRP.
Claimed weight is 1125g.
We now have real world measurements on the Trail Boss.
The measured tread width actually measures 3.0 on a 45mm (internal) width rim.
Take a look on our Plus-Bike-Data page for more info.