Yesterday, I got an email notification that Japanese is now available on Duolingo (http://www.duolingo.com). I took the placement test on there and saw that I passed the first four skills, which is basically about hiragana :)
I started that Japanese course on Duolingo 6 months ago on web. ^^
However, it was officially released on the apps 5 months ago and on web 17 days ago. I hadn't noticed they'd finally got round to sending out the notification emails until you mentioned it. I received that email the same time as you.
Duolingo is a good place to put some of the words you've learnt in JapaneseClass.jp into practice in sentences. ^^