Seems that Klopsi managed to build something (2015-02-05):

• klopsi-u3: so far i managed to build sailfish OS and boot into it on the device
• klopsi-u3: and telnet and ssh to it
• klopsi-u3: no screen working, no keyboard working, no gui
• klopsi-u3: no camera, gps, wlan

But he was not able to build working build (2015-06-03):

• klopsi-u3: i just want sailfish on my droid 4
• zhxt: try to build one
• klopsi-u3: i did
• klopsi-u3: i tried porting to droid 4 but failed
• klopsi-u3: nothing worked
• klopsi-u3: except for the vibration driver
• klopsi-u3: i could make the phone vibrate
• klopsi-u3: if anybody wants to try porting to the droid 4 i will send you a phone

There was also antranigv considering porting but I guess he never actually started (2015-02-05):

• antranigv: well, now I hope I'll buy droid 4, then port Jolla
• antranigv: Sailfish I mean
• antranigv: I ordered a Droid 4 is that good news?

I'm starting to despair since those guys were not able to succeed. However there is hope since Galaxy Nexus (maguro) has Salfish build (alpha) and similar hardware than Droid 4.

Anyway I'm going to set up Linux tomorrow and check what I can do. But we are going to need help!