Previous indications from management were for the initial 8 B787-9's to replace 3 B744's (S,T & U) in 2018/19 and 2 A330's - this morning's announcement says that they will be replacing 5 B747's (M, S, T, U & OEB) with no mention of the A330's so they might stay a bit longer until the next tranche of B787's arrive.