@G-Matt , that pic Luke uploaded is from the National Handmade Bicycle Show. It has similarities to the Trek, but was a custom handmade frame.
There are a number of companies with a 'plus' tire sized model for 2016 - 17. Quite a few with fully rigid frames, a large number that accommodate a front fork suspension, and a couple with full suspension.
The tire sizes range from 27.5 + (also measures to 650 b) that come in widths from 2.8 - 3.0. Also, Trek and Salsa, to name a couple of the leaders in this trend, have 29 + bikes with 29 x 3.0 tires!
I have ridden 3 of these; Trek Stache (full rigid, aluminum), Salsa Woodsmoke (front fork sus, carbon fiber frame), and Salsa Deadwood (full sus carbon fiber frame). Here's a pic of me with the Salsa Deadwood at a demo event a couple weeks ago in Arizona. The bike was amazing! Like a monster truck on mtb scale! And surprisingly, not heavy feeling. Rode very much like my personal 29er full sus bike; only rolled over and through more obstacles...
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