Hopefully, the solar panels will be able to get sunlight before the electronics freeze. Once that happens, it's likely game over. I don't know the battery life in sleep mode, nor what temperature minimum the electronics can withstand. Has anyone found this information? I know without heaters, current flight hardware lasts only minutes.
On the plus side, useful science data was acquired from Philae and this will give us new insight into comets.
Oh yes, and ESA gets the award for the coolest
video associated with the Rosetta mission.