Hmmmmm. That's deep. And I guess you wouldn't reveal your sources? I'll keep this in the back of my mind but I wouldn't base my conclusions on this piece of information. But thanks for the hint!
For me, it's one step at a time. Curiosity about short term projects will be satisfied soon. So I avoid burning in long term curiosity
But yeah, Block 4/5 is a very interesting subject. I think details of Block 3 started leaking in 2015, just around the time when Block 2 was going into production. So it makes sense that we will start hearing more on the topic of Block 4 just around the time when Block 3 is about to start production. If my previous analysis is correct, then second half of 2018 seems a suitable timeframe, but don't hold me to it!