A few more articles came through the Internet while I was in Indianapolis, and thanks to Twitziller for pointing them out.
On Flickering Myth, they take a massive and extremely in depth look at many of the effects used throughout the G.I. Joe: Retaliation film. This is a huge article but has some really cool information about the film and what was required to get some of these visual effects implemented.
On the Art of VFX site, they speak with Bill George who was the VFX Supervisor from Industrial Light and Magic. They look mostly at the mountain battle sequence and London’s destruction, but there is some other insight throughout the article as well.
Good stuff here.