10nm is not so far!

TSMC and Samsung already did several 10nm tape-outs (e.g. smartphone processors of Qualcomm and Mediatek). These kind of technology will be pretty sure part of the next gen smartphones in 2017.

Globalfoundries bought IBM's microelectronic manufacturing business completely in 2015. GF/IBM skips 10nm and goes directly to 7nm, but there will be for sure no 7nm products in 2017.

Last potential foundry player (in this league) is Intel. They are probably ahead of TSMC and Samsung, but very picky with respect of selecting customers.

Meanwhile Bitmain is a “midsize” TSMC customer. If they want, they probably can get a 10nm production slot. But why should they invest another $10M NRE if nobody is challenging them at 16nm?
Anyway I'm sure that Bitmain has already access to the TSMC 10nm technology and is designing the next gen ASIC. So they will go into production as soon as they need to.