It is very likely that this price up is at least partly due to new coin BitcoinGold,people still have fresh memories on last fork and BitcoinCash who make nice profit for them.Nobody wants to miss the possibility for new profits and trying to accumulate as much as possible.
It is difficult to say is this the only reason why we are so close to 6000$,but demand for BTC is big,more buying then selling is always causing price increase.Probably we will see correction after hard fork is finished,it is always been like that-after pump always come dump.
The fact of the matter is that I probably will use the reality of the same case as it was with the next fork, when practically I got new coins in my wallet while doing nothing. I think that Bitcoin's new double will be no worse than my predecessor ..