An interesting note on polyphony (no pun intended):

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...Powered by Roland's Groundbreaking New Synthesis Chip
The new Fantom-X Series comes in a choice of three keyboards, but they all have one thing in common: Roland's new sound generator chip. This chip is Roland's most powerful to date, and it not only makes it possible to play expressive 4-tone Patches with 128-voice polyphony, but it also raises the Fantom-X Series' waveform capacity to approximately 1GB when fully expanded - far more memory than any other musical instrument on the market. What's more, the internal wave ROM has been doubled with quality-focused sounds that will please even the most jaded player.
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4-tone patches with 128 note polyphony! I hope Korg reads this. If they use this in an arranger keyboard, it should go a long way to satisfy concern of people like myself.

Regards,
Alex