Well you won't be getting G.INP anytime soon.
As Overclockers are listed as a seller
Not entirely sure on the full spec of this but saw this listed on the TP-Link website. As Overclockers are listed as a seller, Maybe they can find out when it is due for release and a bit more on the spec?
I just thought seeing as their last models used lantiq then maybe this might be the same.
http://uk.tp-link.com/products/details/cat-15_Archer-VR900.html
A little birdie tells me that whilst VR900 v1 uses BCM63168 SoC, there's a v2 in final stages of development that uses a BCM63137.(Same SoC series apparently).
It's anticipated that TP-Link UK should receive these units for testing in the next few weeks.