Rosetta is now 'orbiting' along a set of revised pyramid trajectories some 100km from the cometary nucleus. It will start listening out again for Philae from tomorrow, continuously through till at least June in order to (hopefully) catch the lander waking up. If the orbiter proves to be stable, with no communications problems, then mission managers may start to lower the orbit in May (if there are issues arising from increased comet activity they will probably edge a little further away from the nucleus).