14nm in 2014, but 22nm "Silvermont" should put an end to the ARM v.s. Intel debate, and 14nm will be the node at which Intel dominates the non-Apple/Samsung markets in tablets and smartphones.
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If you are assuming that Silvermont will have a compelling performance advantage over ARM and thus drive into the broader tablet/phone SoC market then you'll be disappointed.
You can compare Clovertrail to the A15 over at geekbench. Clovertrail has a slight clock advantage and 2 extra threads yet the A15 has roughly the same integer performance and double the floating point performance. I've seen claims of 50/60% performance increased for Silvermont over Clovertrail, which will be split between IPC, memory IO, clock boost and 4 real threads V 2 real/2 hyper.
By the time Silvermont is in the market, quad A15's will be common place.
Its Airmont@14nm that things get really interesting:)