You people need how to read - these were restricted share giveaways to the execs. Here's a clue - when you see S-4's filed for all the executives on the same day, it pretty much means that the company issued a bunch of free shares or options to the executives.
Perhaps it was in lieu of cash salary/bonus payments. It can be a voluntary choice of the officers of the company (especially, those who wanted). A smart idea because it saves the cash needed for extended trials and, at the same time, guarantees retention of key employees. These employees wouldn't do so unless they are convinced that they will benefit substantially doing so! Thus, in my opinion, this is certainly a good sign of better times ahead for the company.
I know that these shares didn't cost the execs anything. But why did they choose to do this NOW? They get bought out now, these folks are gonna be zillionaires. And these are the very folks who are in a better position than anybody to know about an upcoming buyout?