Centre Hyd System is a very interesting one when it comes to ETOPS. There is no definitive statement as to if it constitues an ETOPS failure or not.. It is somewhat dependant on circumstances.
I do wonder why the alternate gear extension hasn't worked at all - that will be very interesting to see.
And SAMR - coating the runway is not necessarily encouraged these days. The benefits are considered negligible compared to the time required to refill the tankers afterwards.
Thereis no doubt that this crew has done an excellent job pulling off a smooth landing without the gear.