Yes, you are supposed to be able do the ota when it becomes available.
Fred, have you done a factory data reset any time after GB. If not, it may be the one thing that will dramatically improve your battery life.
EDIT: FOR CLARIFICATION.... IF YOU ARE STOCK ICS .215 THEN YOU ARE SUPPOSED TO BE ABLE TO UPDATE TO THE OTA PATCH. If you are rooted, then you will have to return to stock to be able to apply the update.
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