Brian Steinberg Senior TV EditorTom Llamas is ready to leap into an increasingly crowded field for evening news.The NBC News anchor, who previously led a streaming evening program at ABC News, is preparing for the launch of a digital evening endeavor for NBC News, a project he vows will have a kinetic feel and range a little further afield than the linear products that still represent the best-known examples of the format.“This is going to be a fast-paced, high-story-count nightly newscast,”