I don't think they'll make a week out of four episodes if they air them by the end of 2008.
WhoBob WhatPants airs on October 13th, if I'm not mistaken...
So why not air two of the four episodes Friday, October 3rd and the other two Friday, October 10th? Maybe pair SpongeBob up with Tak or El Tigre or Barnyard. That's what makes sense to me, considering WhoBobWhatPants is probably production codes 611, 612, and 613, and the original order for season six was 13 episodes. I doubt Nick would be that quick to air episodes they just ordered a few months ago.
Of course, nothing Nick does makes sense anymore, and why should it? It's going downhill.