Howley has come out and said that he got the selection wrong in the Autumn/Ireland game:
http://www.bbc.co.uk/sport/0/rugby-union/21796210.
At least he's learning.
This combination has all the ingredients to be great. Sam is quite a physical player, very physical in the tackle, explosive ball carrier, a good support runner, and most of all very strong over the ball. Tipuric is such a footballer, all the skills you could ever wish for in an openside. He uses his technique and speed to secure turnovers, basically getting in position and getting his hands on the ball before any opposition player can clear him out. He's got a good tackling technique as well, although needs to be careful about lifting the leg. His more physical than his physique appears as well.
Apparently it's in the works. It won't be a fully synthetic pitch like Sarries have, but more likely a hybrid like at the Liberty stadium.