Based on last year/years bull run, what do you consider to be signals that indicates this kind of movement? Do you see these in nowadays' BTC/Altcoin markets?
Nope. We are still in 2015 of last Bitcoin cycle. Far from 2017, the year you are talking about.
yeah this is true. though the cycle is a lot shorter this time (~9 month bear market as opposed to ~14 month bear market last time), but yeah we're in the equivalent to the spring of 2015 right now.
Probably we'll be in a new bull market sometime in the next 1 - 5 months. End of Q1 2019 at the latest.
It's pretty random if you ask me. We don't know when the whales would start a snowball effect and pump the price to start fomo. It's hard to base when from past bull runs since what caused it then may very well not have the same effect now.