Is pinyin going to be eventually added when you hover over characters?
I think this would be really helpful.
You can install the Perapera Chinese dictionary plugin to achieve this functionality (check 'hide definitions' to show just pinyin).
I'd not object to pinyin in hover definitions, although I do find the TTS' pronunciation perfectly clear the vast majority of the time. I like the way the DL has sought to minimise pinyin and focus on characters and audio, although it probably wouldn't hurt to have a higher proportion of pinyin-based exercises right the beginning of the course, as new learners won't automatically know pinyin.
I just started learning Chinese and I am sometimes having difficulty in finding the correct pinyin corresponding to the Chinese character. I mean I recognize the Chinese character and even know what it means but then fail to type it back because I cannot seem to find the correct pinyin. It would help a whole lot people like me if the pinyin was added to the tool tips so we can better develop pinyin-character association.
Currently, to solve the problem I am copying and pasting the Chinese character into Google translate which then shows the pinyin that I don't remember. Then, I use the pinyin to type back in Duolingo (I try to type each word instead of word select exercises)