No new licensed songs have been added to DDR A in the US since its release here (Determination was revived not too long after the release though).

Asian regions use what is called the eAmusement Participation system, which is a profit sharing system (the arcade owner pays Konami based on how much use the machine gets). This is why the machines using this system require a network connection to boot. And I suspect is makes licensing new stuff a LOT easier. I haven't done a lot of research, but I believe that prior to the switchover (which happened sometime in 2013 I think?), licensed songs hadn't been added to the games after their release.

As far as I know, the US and EU versions of DDR A don't use this. The arcade owner buys the game for a larger price, but apart from a basic network fee (which would be optional), the owner doesn't pay any more.

I was also bummed to find out Japan got the original Cirno's PMC while we'll likely never get it : [
First encountered that song a super long time ago (on a fan-made DJ Max newgrounds game) and thoroughly enjoyed it.