As we know there was a reference to the Castle in a disclaimer about the Pre. Up until now I have heard everyone refer to this as the internal code name for the Pre. The assumption is that someone in
PRPRPR$forgot$ $to$ $change$ $Castle$ $to$ $Pre$ $before$ $the$ $announcement$ $went$ $out$. $Could$ $it$ $actually$ $be$ $another$ $device$ $we$ $havent$ $seen$ $yet$?
It is just as possible that Palm copied the disclaimer (off another devices docs) and forgot to change the device name.
Just a thought