From Grant's link
http://www.uwgb.edu/dutchs/STRUCTGE/EarthMvts.HTM
Quote:
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Note that in both places there is a shallow epicontinental sea directly under the center of the ice sheets, evidence that the rebound is not yet complete.
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This is exactly the situation that will occur when and if the Antarctic sheet melts; a shallow, central sea will exist between East and West Antarctica which will gradually empty into the ocean and disappear as the continent rebounds, thereby raising the ocean level.
One interesting aspect is the question of how isostatic recovery occurs at all; does it include a flow of material in the upper mantle towards the rebounding region, or is it simply due to a decrease in density in the local rock? I expect it would be a bit of both.
But note that a flow of material in the upper mantle towards Antarctica could, just conceivably, lower the level of the sea-bed and so lower the level of the ocean a little. But I think this effect would disappear after a while as the plastic aesthenosphere found its own level.