My brothers still on ADSL, only reason being it was the cheapest option at the time, and now his fortunes have improved (new full time job) we were going to upgrade his ADSL to FTTP when his contract expired.
He's just told me that two weeks ago he received an email from his ISP Shell Energy saying that he will be getting a free upgrade to "Superfast Fibre" and his average downloads could be up to three rimes faster, so I'm guessing he's getting a free upgrade to 40/10 VDSL. It also says to "rest assured, you don’t have to worry about a price increase at the end of your initial contract term"
Dependant on what he's being charged, pretty sure it was around £16, and if it stays the same then there's no point upgrading him, as that will be plenty fast enough for his needs.
Pretty sure I read somewhere else on here recently that someone got a free upgrade from ADSL to VDSL recently.