Does anybody know if they will add the rest of the katakana to the course?
It might be a little early to ask this, but I would just like to know, since not all of the katakana are included currently and the course only teaches hiragana and kanji. If not, we can always just memorize them outside of Duolingo.
One of the course contributors says that "Duolingo’s course teaches ... all 50 Katakana characters". So maybe you just haven't seen them yet?