Jolla announced few days ago the status of port for xperia x. Jolla announced that it was working to bring sailfish os to xperia range devices on MWC this year.
Xperia X runs on 64bit processor. Jolla said that it faced quiet challenges porting sailfish to it.
Currently, a small team will be testing the version thoroughly until they release the final version.
More info https://blog.jolla.com/sony-xperia-project-update/