Seat plan showing LGW-MCO 747-200?

My seating plan for LGW-MCO seems to show a 747-200 on 28 July out to MCO and return 13 August. Is this a way of taking the 400s out of service to upgrade them? [:(]
ANyone else notice this/have any news on the tactic [?]
ANyone else notice this/have any news on the tactic [?]