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At Sea Otter, E13 showing a 10 & 11 speed cassette that goes from a 9t. No price yet though..place you bets. I reckon about £100.
http://m.pinkbike.com/news/ethirteen-exp-cassette-carbon-cranks-sea-otter-2015.html
Should be good for burning up them tow paths like a boss.
Didn't Hope say that they found a 9t cog at the rear wears fast and has issues with vibration and chain wrap? I find the 10t cogs rougher than the 11 as it is!
Interesting. If they've made it work, with a 30t ring that'd have the exact same range as a 22-36 double with 11-34 cassette, which I've been finding fine for everything.