..Just what I need to wake up to before I go and fix 'em.
What I can tell right from the pictures is that it's not a US operation but the NTSB will be involved because it's a Boeing and thus a US built airframe and interest. Expect to see most of the findings in the next 2-3 years and a good chunk of it being changes to landing protocol and probably some looking into the 777 and San Fran's Instrument Landing System hardware/software. Probably also another in-depth look into the 777's flight control software as well. Also look into maintenance practices from the airline as well as the fitness (awareness wise) of the flight crew.
Long short looks like he came up short on the threshold (and I mean WAAAY short) so once they find the CVR/FDR module somewhere in that mess they'll be able to tell what the heck the 777 did on landing and how the flight crew reacted.
With this aircraft it's hard to tell, as there have been isolated instances of the plane going rogue (less so than Airbus aircraft) but nothing like this that I've heard of on landing where it essentially belly-flopped.
Odd thing to note: The onboard fire. Last time one of these 'landed wrong' was a British Airways bird and that was a simple inspection/swap the main gear out and put her back into service. This one is a total loss. Never heard of them burning like this on landing.