Sweetwater are providing a moving target. First it's March, then it's April, what next? You can't set any store by what people trying to SELL you something say. They want your money, and if exaggerating arrival dates so you don't buy something currently available helps, then that's what they do.

My best bet would be no later than June, but that's just a BET, and anyone telling you anything they say is anything solid is just lying to you. Factor in the turmoil in Japan right now, and all bets are off. It will get here when it gets here.
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An arranger is just a tool. What matters is what you build with it..!