The phrase “I heard Bruce might show up” suggests that there is a possibility or rumor that a person named Bruce will attend an event or gathering. The use of “might” indicates uncertainty, implying that while there is some information or speculation about Bruce’s attendance, it is not confirmed. This could lead to various interpretations depending on the context, such as excitement about the possibility of seeing Bruce, curiosity about why he might come, or simply sharing gossip about potential attendees.