According to TVLine's Michael Ausiello, Sean Hayes will be guest starring in an upcoming episode of Parks and Recreation, which will air in the spring. The episode puts the spotlight on Leslie's campaign for city council. Here's an excerpt from the article which offers some more details on Hayes' role:
Hayes will play a revered TV journalist who the locals refer to affectionately as “the Matt Lauer of Indianapolis.” His character lands a big interview with Leslie, potentially boosting her election prospects. Or not. Rumor has it the high profile chat doesn’t go as smoothly as Leslie would have liked.
Link to the full article:Parks and Recreation Casts Sean Hayes in Season 4