I'm a little late on this one, but Dan did discuss it on the podcast this week. Pirate Pop Plus is now out on Steam, which you can get here. A few weeks ago it was released on Wii U, and 3DS as cross-buy.
The Japan developed puzzle game was published 13AM Games, who released Runbow last year for Wii U. You can pick it up on Steam for $5.49 CAD.
Additionally, it looks like we won't have to wait long for the next piece of 13AM Games news. They tweeted today to look forward to Monday (tomorrow) for something, which looks to be maybe secret characters? Perhaps some Pirate Pop Plus DLC isn't to far away. We'll find out together, tomorrow.