That is an important observation, but also it is worth noting that Intel reports earnings tomorrow (ie, they're in a quiet period) with the CEO role changing hands in less than four weeks, so presumably they would announce this move with the earnings report (or address it on the investor call) if true.
Not sure I understand your question. Between the end of a quarter and the announcement of that quarter's results, US public companies don't generally make major announcements outside of scheduled events (earnings call, press conference, industry showcase, etc). Even more so if there is uncertainty around the company's valuation -- ie, a leadership change.
Aside from the insider trading comment another user made, with which I agree:
Material information ought to be accessible by all investors in a fair and orderly way. This is the same reason that stocks get halted for impending news intraday, and earnings reports are released outside of regular trading hours (except perhaps for ADRs and other multi-market securities). Scheduled injections of information make it easier for market participants of varying sizes and geographies to receive and digest information at parity with one another.
Legal concerns around insider trading. People in the know of the company are reviewing the accountant reports. If there is a surprise they can trade on that and make a lot of money. It is easy to guess what will happen to stock prices if you real results are off from what everyone expects.
