From the "grasping at straws" department this new VZW map shows the Droid Charge coming to an end 9/30. My guess is Samsung will not want that competing against whatever the Prime turns out to be. Also, the model number floating around for the Prime is SCH-i515 and the Charge is SCH-i510. That makes the Prime seem like the successor as well.
Verizon Map
Verizon Map
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