IMHO, when any offer is on the table, it would be wise to announce just that, WITHOUT any price mentioned. It would surely spike the PPS up. They need to generate a bidding war between a number of companies and not just take the first offer.
If they play their cards right, and to the benefit of all the shareholders, the PPS can possibly be selling at over and above the actual aquisition offer, before acceptance.
I mean, isn't this what we would all love too see.