I think that is conservative. Current price action is ridiculous. Stock should be trading in the $130's at a minimum right now, and as projections rise (which they will) so will PPS.
Annabel citing the rumor that Novartis is interested in HZNP is also definitely intriguing. I would suspect that that comes from a reliable source, and probably means they are looking into it but haven't made a decision yet. Won't be easy as I doubt TW is in a company selling move (but would be fun to watch).