Testing some changes with 5.3 on my local dev and with some testers. The developers of Cauldron have found a way to update the software without running afoul the current pile of DMCA that surrounds Bukkit so we can update a few mods that have been acting a little strange.
The downside is there is a very real possibility AE systems could get broken. So far in testing I have not seen this but everything changes when we push these things to live!
Tentative change log can be found on the wiki (if you want to contribute/edit the wiki, let us know!)