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One of the biggest benefit is simply the rims can be strong and light at the same time.
The Mavic XM719 in 26" weight as much as the H+Son Archetype while being stronger and wider.
Even lighter with disc brakes, ZTR Crest is a mere 340g in 26" which is lighter than the lightest 700c rims brake wheel out there.
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There's an article in this month's bicycle quarterly too (Jan's publication) about their idea of an 'enduro all road bike' using the above 'travel bike' prototype/custom thing.
Can see the appeal right now. It's 16-22c, sunny and I'm stuck in a house 30km from a huge national park/mountains with 3 screaming children...
Sneak peek:
Very interesting news from Rawland.
http://ravn.rawlandcycles.com/
and here: https://groups.google.com/forum/#!forum/rcog
Recently Jan Heine wrote also (maybe no coincidence) an interesting article about smooth rolling 26" wheels;
https://janheine.wordpress.com/