The halving is talked about a lot and every one keeping bitcoins now has big hopes for that time. The general hope is not the next bitcoin bull run exactly, but what the prices will be after the halving. There is a hope that there will be a rise in price after the halving even if it does not set a new highest price. If many positive events favoring bitcoin happens just before the halving, it can trigger a bull run, if positive events also happen just after the halving, I think a bull run can also be triggered. I may be wrong, but this is what I think.