Ignore all the stuff about provably friendly AI, because AFAIK its fairly stuck at the fundamental level of theoretical impossibility due to lob's theorem and its prob going to take a lot more than five years. Instead, work on cruder methods which have less chance of working but far more chance of actually being developed in time. Specifically, if Google are developing it in 5 years, then its probably going to be deepmind with DNNs and RL, so work on methods that can fit in with that approach.
Yes. I think that we need not only workable solution, but also implementable. If someone create 800 pages pdf starting with new set theory, solution of Lob theorem problem etc and come to Google with it and say: "Hi, please, switch off all you have and implement this" - it will not work.
But MIRI added in 2016 the line of research for machine learning.
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