Comcast (NSDQ: CMCSA) executives are not commenting on rampant reports that the company is on the verge of purchasing a stake in NBC Universal (NYSE: GE). But during the companys earnings call, executives went out of their way to repeatedly say that they would be disciplined in their approach to acquisitions. Comcast CEO Brian Roberts started off the call by acknowledging what he referred to as rumors and saying that that the company would only look at opportunities in its core businesses tha....

