The meaning of beening pushed into the viod in the case of Morgoth is stated by Tolkien to be executed and as a spirit band from Ea. The last part needed the special premission of Eru himself. It is very unlikely that such a premission was given in a minor case like Sauron.
The quotation given by Amarie could thus only mean the first part of the fate of Morgoth: to be robed of the physikal shape for ever. And that is exactly what is suggested as the fate of Sauron by Tolkien: a bodyless spirit fixed in the desire to rebuild a physikal form for itself.
Respectfully
Findegil
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