I agree with Mike - it'd better sound very, very good or all the specs in the world won't make any difference, and I've heard some Alesis keyboards in the past that didn't fare well against their competition for that sole reason.

In many ways, the Alesis sounds similar to the Yamaha Motif except the Motif does thing like virtual sound modeling or FM synthesis through the addition of plug-in cards. That's going to be a problem for the Fusion: it has to trump the competition, not just match it. The Motifs are very well established in the market so if the Fusion doesn't offer more in terms of sound quality and/or feature-set then people won't buy it, especially if they already have a workstation of some sort.

I wouldn't rush to preorder this synth until you've heard it or tried it out for yourself. I really do hope it sounds a good as it reads.