The last time we saw a large number of Beast Wars toys reissued was for Armada and Universe in 2004-2005. I had assumed that the toolings had degraded since that point, but it may simply be that Hasbro decided to let them rest for a bit and had other priorities. Megatron, Cheetor, Airrazor, Rhinox, and Terrorsaur were all (slightly) retooled for their Armada releases, but I don't imagine that would have involved altering the original toolings.