Been trying to follow this thread but I don't know where the whole rear locker rumor stands. I was at the western Xterra championships this weekend and they were previewing the 2005 Xterra (and the pathfinder) the Nissan reps confirmed that a rear locker will be a factory option when they are released. I am pretty much sold on the 2005, my only complaints is the rear half resmbles the Honda element from a side view and head room feels smaller in the front (i'm 6'1") although Nissan said that could be the seat adjustments which I didn't fiddle with very much.
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use the SEARCH function! Now you know... and knowing is half the battle!