Despite all of the best efforts by the SEC, trading on insider information seems to happen regularly in most stocks that I follow. It's not uncommon to see inside information posted on yahoo message board before it becomes public. Sadly, all you have to do is look at the trading in almost any stock before almost any major news event was disclosed for proof of the above.
Therefore, it's pretty unlikely that the SEC is going to get involved because someone posted about an impending press release before it happened.
I've also seen alot of people trade very badly on insider information. It takes perspective to judge how significant news is (insider or public) and it seems to me that there is often a tendency to over-react. Not every press release is going to move a stock.
Even the market's reaction to major news can be hard to judge. For example, even weeks later and despite extensive debate, FVCX_Poster and myself still disagree on whether FVCX had a good Q1 or not.