Bandai Namco is currently developing several NX titles. Smash Bros is planned to be a launch title. I am not sure about the date - yet ;).
1) About Resident Evil 7: Yes, it's in development. The entire game will go back to RE's horror roots and (essentially) be a clean slate.
About that first Nintendo-DeNA mobile game: Expect the unexpected, and soon.
1) The Nikkei just reports Nintendo will stop producing Wii U within 2016. It doesn't say they will necessarily start selling NX in 2016.
1) Nintendo will develop smartphones games with DeNA, using Nintendo IP (!).