Shuttle Muddle

Blackjack · 2013-03-01T14:31:29.000Z

First of let me apoligize for the rhyme. :) Ok, so I was looking at the 2010 set 10213 and 2011 set 10231 on Brickset, and can only find about four or five tiny differences between them. Does anyone know why Lego re-released it in 2011 with those almost imperceptable changes?