3,600 homes is a mere blip compared to the number of homes Openreach is passing with FTTC each week. Sky is likely to adopt Openreach FTTC for a lot of the country.
That article gives the impression that the Sky trail is FTTH (and the OP quoting speeds of 90 would seem to indicate that) If that is the case, it doesn't compare too badly with the 10000 installations that BT FTTP has achieved so far. Theyre pretty lucky customers getting FTTH free for 2 years!
Also it will be interesting if Sky adopt Openreach FTTC - surely then it will not be LLU, and they will have to pay for bandwidth? That would cost them a fortune, because they've attracted alot of heavy users due to their (lack of) FUP policy and also they've recently rolled out their Anytime+ service which I imagine also uses large amounts of bandwidth even for people who dont use the internet! With them partnering with TT on the trial, whats the chances of them thinking of biting the bullet and installing their own FTTP network shared with the other LLU suppliers? It would cost a fortune, but it might be cost effective in cities.