Unless your less than 400m from the cabinet I wouldn't expect G.Fast till after 2020.
Aren't OR deploying G.fast from the distribution point?
Your guess is as good as anyone's.
Research into G.Fast started life with the expectation it would only be viable at the DP, and has been designed and standardised with that in mind. However, it turns out that the copper has worked better than expected, and longer distances can be used while still allowing for a decent speed upgrade. BT have been asking for improvements to the standards and the chipsets to allow for deployment further away from homes than "just" the DPU; my current belief/expectation/guess is that distances up to approx 300-350m will be the maximum.
That has given OR some relief (they can deploy fewer G.fast nodes, so it will be cheaper), but a conundrum too - where do they choose to put the node now?
So one of the aims of the current G.Fast trials is to find out what speeds happen in reality, and what distances. That will let Openreach plan a deployment.
Until they figure the answers out, we won't know a blessed thing. Once they figure it out, we still won't know - we'll have to guess from watching where they activate nodes.
But...
While they are figuring that answer out, we can speculate a little.
It will almost always be true that they'll have to locate one G.Fast node where the PCP/FTTC node is - to support the premises close to that cabinet. There is already fibre, already power, and already a set of premises. A no-brainer.
Extending that thought process though, we can see that if BT put a G.Fast node at every PCP/FTTC site, and aimed at 300m reach, then they would likely be able to offer service to about 30% of lines in the country - by this:
http://postimg.org/image/bp372fcnn/By coincidence, 30% of lines in the country is BT's target for G.Fast by 2020.
Edit: But the coincidence might just be that - and they're planning a different 30% entirely, targetting specific areas.If they did that, and only that, then they'd only end up offering the 300Mbps service to people who could already get 80Mbps - politically, lots of people would be up in arms at this choice. And it might not get the best takeup.
It's all speculation, until we see what Openreach end up doing.