The halving price already seem to be set in. Which means the price will float around the 450 if you ask me. But yes the halving is coming and there are still a lot of things that can be happen. For example testing where the real support is (probably somewhere in the 320 - 350 area)
No it's nothing to do with the halving. It is the effect of manipulation that Chinese started in some of the big exchanges.
No way halving will give bumps to the recent price rally without the activity of the CN manipulators.
The recent rise of the bitcoin price is good for the sales of the new Bitmain S9 miners. So it could be caused by the Chinese.