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.