Between its management shake-up and the rising probability that it could be acquired by a larger peer, Campbell Soup (NYSE: CPB) has seen a spike in investor interest lately. In fact, the packaged-food specialist's normally sleepy stock has had a volatile few months -- including a slump following its first-quarter earnings release in late May, and a spike in June on rumors of a pending merger.Many key strategic questions will be answered when the company announces its second-quarter results on Thursday, Aug.