I've been watching to this thread almost since the beginning (particularly because of studying interests) and I would really like to add my two cents after reading all opinions above (I've also registered just several minutes ago exclusively to participate in this thread).
I have some experience working in molecular lab (though I was on team of cancer research, don't want to dive into details) and I'd say that the human trials in 2019 or even 2020 is unrealistically optimistic. With all my respect to Riken and to Dr.Takashi Tsuji, but based on my pretty humble yet experience, I just don't believe nor I can imagine that the work in lab going so rapidly that a lot of calculations were carried out in a moment. I mean, in this field there just too many processes that physically can't go much faster even with extraordinare money support (I would use here the rule from physical chemistry - the reaction rate is determined by the slowest stage. It just describes the situation the best). I assume they use both in vivo/in vitro and in silico studies and you can never predict which subteam (if I may call it like that) will slow down the whole research. I mean, there just so many unpredictable things. Also if they use calculations of moleculas or something (for example finding the most stable conformers, especially organics), it is just extremely slow work itself (not because of humans, but because even modern computers can't handle this work really fast).
In conclusion, I would be extremely happy to see the progress in the closest future and I honestly hope they'll do it, but 2019-2020 human trials sounds too unrealistic for me. Though, need to mention, I believe it will not be too long time of waiting too, even 5-8 years nowadays is a big deal for research. In my opinion the hair cloning will be ready just in time range above.