As with any announcement / advertisement / rumor / "leak" that comes from anywhere other than these forums, please don't get all worked up about something unless it's officially been announced by HMX. Until then it's safe to say that anything else you hear should be taken with a grain of salt.
Furthermore, this thread blows my mind. With so many genres represented in Rock Band already, why would the addition of Country be such a huge shock? We'll have Country in RB sooner or later. Ideally we'll have all the various sub genres that people are clamoring for (hardcore punk, goth, ska, etc) eventually. We haven't shut the door on anything.