Just saw this over at Rebelscum:
Mark: The Nexu (Arena Beast) has shown up in two very distinct versions. While there's an obvious packaging variation noted by its placement in the bubble and the orientation of the tails, the toy itself exhibits some slight deco variation as well.
The early versions, shown on the left of the comparison image, features darker spines and a lighter coat of fur. The version on the right, recently found at Target and Wal-Mart, features spines of a browner shade, and slightly darker wash for the coat.
By all other standards the toys are the same, but these differences alone should be enough to make variation hunters take notice.
MTFBWY and HH!!
Jar Jar Binks