I think that's a possibility. Whichever company is interested in POSC probably told them to keep quiet, so that other potential suitors didn't/don't come knocking sooner, and create such a bidding war.
I have no way to prove that, but that is a fair assumpition.
It's a fair assumption because in the device market, buyouts are more commmon than partnerships.
So, if Company XYZ is interested in partnering with POSC and then buying out, it would make sense that they have less fingers in the pot, for as long a period as possible, giving them a bit longer to make a decision on what to do from a business standpoint (longterm partnership/buyout), and prevent a possible bidding war, getting the company at a lower price.