I have not fully read the Ardor concept. Will there be a new wallet for Ardor or can we still use the current updated Nxt wallet? If not, will the API change? I am currently designing a addon and I do not want to reprogram the whole stuff later again.
For the staking you don't need a new wallet. Ardor will only launch in 2017. Regarding the API I don't know. Join Nxtforum.org for more info.