It looks like Qualcomm is the most likely aquisitor. That doesn't bode well.
Since the early 90's I have been using an email client called Eudora, owned by Qualcomm. Back in 2006 Qualcomm ditched the original version, stopped all support for it, and ensured no one could take it over. The new version is not backward compatible to the original, and seems to have not been updated since 2010.
So if Qualcomm is going to be the new owner of Reciva there could be trouble ahead.