Pre-order was opened to China, and ending tonight at 12am, China Time Zone (UTC+08:00)
So players outside of China, your only chance of pre-ordering one is getting in touch with someone from China.
Shipments to stores should start after the 10th May. No idea when it's going to go on sale though, I got words that YoYoExpert is going to be one of the store carrying these, so yea.
Information you might want to know is, these are believed to be relatively affordable, and there's only 200 pieces produced for this batch, and then there's going to be refinement to the next, so collectors, you might want to camp on this, because you know the next batch will never be the same.
And no information on when the next batch will be ready.