It's a Prelude PLUS some stuff the Prelude doesn't have... (and minus some stuff, I'll admit)
I expect to see it between $1000 and $1500, to be honest. Be a bargain if it's cheaper. Look, the Ketron Audya module is almost the same price as the Audya. It SURE isn't the same price as the little sound module they put out!
Sonic Cell has HALF the ROM of a GW-8. What does the Cell do that's significantly better than a Prelude (apart from detail Tone editing and creation)?
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An arranger is just a tool. What matters is what you build with it..!