Yes, its not like there are 10 years of data and 3 previous halvings already.

Nothing important will occur during the halving, maybe before, and certainly after. Bitcoin production is dwindling to the point it simply won't matter how little of them are produced anymore. I have said before that most bitcoins that there ever will are already in the market and this is a fact.

Don't think mining is fundamental for bitcoin's price, the more time passes the less influence it has. Some people seem to believe the cost of producing a bitcoin is somehow related, but it isn't. Value of bitcoin is determined mainly by the usefulness factor by those who decide to own it. As time passes, the actual production cost has less and less of an influence to it.

You say its unpredictable but in my opinion its fundamental price won't deviate much from the logarithmic curve in all its lifetime. The earlier the stage, the faster it rises, the later the stage the slower. But never back down, because production is limited while the number of people that find it useful can only increase until a point (ie. world's population).