Guys, this news is a day late. July 1st in Japan started at 8am on June 30th, West Coast time in the USA. I positioned myself for this in Japan, and have seen Bitcoin continue to fall. In fact, it fell faster after the tax ended.
It may have made a difference a month ago, and probably will make a difference in the future. But right now bitcoin is too bearish for this change to help.
The change came into effect on Saturday morning, so I suppose there is still the outside chance that trading may pick up on Monday (that's Sunday evening to you people in the States). At this point, I am not expecting much though.