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Well, freezing the ice does not change the mass - it does change the density.
The portion of the ice cube not submerged is a fraction of the portion that is. This "undisplaced" mass is essentially negligible.
As it turns out, the volume of water displaced by the ice cube is proportionate to the differences in density between liquid water and ice. This turns out to be a very small ratio and as such, no difference in water level will be observed. Purely from a numbers perspective, the water level would however decrease at the point of final thaw (or at approximately 4'C).
Man .. studying for my physics final (which is tomorrow). I'm at equation #160 or so now ... yikes !
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