Philae apparently bounced off the ground very slowly and lander may be starting to turn because the fly wheel has been turned off at touch down.
To complete the story; yes it has probably bounced off, indicated by the constant fluctuations in solar power strength and radio link. However, after 2 hours (!) these fluctuations stopped. Also the radio link became stable. They speculate that this indeed indicates a 2nd landing, this time stable. Still without harpoon being used.
Speculating that this 2nd landing (2 hours later!) was indeed successful, it's an interesting thought that the harpoon is still unused and might still be applied at a later point in time. For example, when conditions get rough on the comet as it nears the sun.
Rest of story: the radio link is now lost, because the Rosetta satellite is getting on the other side of the comet so it can't see Philae anymore right now. They did receive more image data (to be released), and will be analyzing the data that has been received so far. Radio link with Philae will (hopefully) be reestablished the next orbit (tomorrow morning, not 100% clear when). Tomorrow morning more news is expected, next live briefing is tomorrow at 14:00.