Hey this S550 is listed in more than one place. This site states a UK release in November and that it replaces the S500. If this new model is legit.., I say it looks great with a black case and speaker grills.
http://www.bonnersmusic.co.uk/buy/Yamaha/PSRS550_Keyboard
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.