latest

consequent, ensuing, eventual, following, succeeding

conclusive, crowning, decisive, definitive

farthermost, farthest, furthermost, furthest, remotest

lowermost, lowest, nethermost

endmost, extreme, outermost, outmost, utmost

penultimate

nine days' wonder (also nine day wonder)

new wave

crush, infatuation

fervor, passion

furor, fuss, hullabaloo, to-do, uproar

bandwagon, crusade, cult, movement

novelty, wrinkle

caprice, fancy, whim