This is really great news. If a country like Japan, which has a huge impact on the world, includes bitcoin in their law, then it is sure to draw attention from other countries and law makers. 
This gives me hope about the future of bitcoin
This gives me hope about the future of bitcoin
For now it won't be accepted as a legal currency officially, looks it's a experiment by their side.
Anyway I think it's good how it's now, if Bitcoin be included on their law it can have negative consequences for BTC users. I think it's better to stay far away from law makers.