[trebleshot]

Marvel changing the MU logo would not automatically make Hasbro re-do the packaging and re-release older figure to just to reflect the change. More likely, what's happened is Hasbro found out that they needed to make additional batces of comic packs and decided to update the packaging slightly (especially if they already had to change the MU logo).

And while it may seem kind of pointless to most of us, it is a way to prove that those "new" comic packs are from a new factory run and not simply leftover stock from the last run of them.