Philae is getting 1 hour of sunlight about every 12 hours. Right now, it's so cold that it has to warm up the batteries before charging them, and it's getting so little light that it can't even do that. It's possible that the rotation might change, but because the probe is surrounded on 3 sides, that's not likely to help. So we'll have to wait for the temperature to get higher and/or the sunlight to get a lot stronger.