After saying they were coming soon a couple days ago the Little Mermaid Tsum Tsums have now been added to the International version of the Game! Ariel, Flounder, and Sebastian can all now be found in the premium box and all three have "Lucky Time" through May 4th, meaning you have a better than normal chance of getting them from Premium boxes for the next few days.
After playing a few games with each, Ariel definitely seems like the best of the new Tsums. Using a skill level 2 Ariel she regularly cleared over 20 Tsums when using her power and I was able to get 900-1000 coins without any power ups.
Have you gotten any of the new Tsums yet? Which is your favorite?