There was a pull request created by @flavioarcega Github user for FTPS support (please note, that FTPS is something different from SFTP).
For me the support for FTPS is also important. I'd like to use wagon-ftp extension for my project site deploying. I could use simple FTP protocol or FTPS with explicit TLS.
only simple FTP protocol is supported for wagon-ftp, which sends username and password in plaintext over the web
secure FTP client may be configured for wagon-ftp