You people have to learn how to use the search function. There are more than ten duplicates of this thread.
The price would rise, the miners would start pumping their saved up bitcoin so the double, so the 12.5 BTC is worth what 25 BTC used to be.
I think the price will rise to a higher level by the halving.
We just need to wait till its so far in my opinion the bitcoin is not to predict, so just wait for it.