Just got a Y700 15 (model 80NV) with i7, GTX960m, 12GB and two drives:
128GB SSD (in Device Manager reported as NVMe Samsung MZ-VLV128)
1TB WDC WD10spcx (Hybrid SSHD)
Interesting to note that Device Manager also reports the presence of a Standard NVM Express Controller under storage controllers.
I think this pretty much confirms that the NVME is supported, at least on the intel based models.