As far as I know - nope.
I'm still waiting to hear about the Miix 710 (or was it 510?) that Lenovo showed back at IFA & look at the reviews. Oh, and the IFA was back in the beginning of September, so I'd not hold my breath for that right now.
Also, here's my reasoning why Lenovo can throw out a 520 so quickly (it's not been 6 months) after the 510 - because they've got so much they've done wrong in the 510.
(Just my personal 2 cents)