As has been tapped its a little new for people to judge things like MPG, reliability and so on.
The press reaction seems positive though. Here in the EU we got a completely new Focus when you got the facelifted 1990s one the last time, but the new one seems to be an improvement on that model so compared to your previous one the new version will be a revelation.
I would wait maybe 18 months and see what the residuals look like and what problems the early buyers have to deal with. Here these will be company fleets and hire companies. After that you will be sure anything you get will have had the launch 'bugs' removed.
All that tapped Ford seem to be on their game at the moment, certainly here in Europe. This launch has closely clashed with the new Astra (GM) which looks spookily similar - interesting fight maybe.
Astra
Focus