GF mentioned 14+20nm also in their FAQ (incl. the first sentence), which I tweeted on 20th September.
But using 20nm (still not common for ARM etc) with more efficient transistors might be OK. In these days it is not enough to make a smaller chip to save $5 on the BOM of a $600 smartphone, but it should deliver more performance and battery life to better suit the more demanding apps.
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