As for the fairings.I am not sure quite what they are doing.They are practically if not totally in orbit when they release.How do they slow them down,how do they guide them - really bad shape at such speeds/altitude.
The fairings are released at far less than orbital velocity...at about 110 km (70 miles) altitude once there is no more atmosphere...at a speed approx. 8,000 km/hr (5000 mph)... less than one-third of orbital velocity (26000 km/hr)
So recovering them is possible...although I don't foresee this as being easy - because they are so awkward aerodynamically... spin and flip like a piece of paper falling to the ground.
Re centre booster.Mmmm that was ambitious (3 engine burn) but perhaps from that altitude they had no choice - but am guessing.
Getting that core back would have been useful to them I imagine as has a lot of new stuff built in.
They have 2 more FH's this year will be interesting to see what they do.
Actually, I wonder how much the center core will ever be recovered...the FH is using the identical second stage from the F9...so any payload increase is from increased velocity of the side and center cores. So the center core at least -- will be moving much faster than the F9 first stage...making sea landings much more dicey unless smaller payloads allow enough fuel for slowdown re-entry burns.
In fact, payloads close to the 65 ton (140 klb) maximum may not have any reusability -- all the cores will be lost. I think typically, the side boosters will be recovered, on land or sea...But even then, based upon F9 first stage velocity at engine-cutoff and fuel weight required in the second stage... a significant decrease of max-payload occurs...to less than 100 klb.and the loss of the center core,,. thus, more expensive launches.
So it will be interesting to see how often the center core is recovered? Elon Musk did say in the news conference that the side boosters are more valuable.