Implies anticipation of someone's arrival, often used when a person joins a gathering.

Expectation

Indicates the need to be attentive, usually because a new person enters a space unexpectedly.

Alertness

Used to notify others present that a new person is on the premises without additional implications.

Emphasizes a sense of importance or celebrity of the arriving person.

Sometimes used jokingly when someone wants to seem more important or dramatic than they are.

May be used in contexts where acknowledging a person's significance upon arrival is culturally relevant.