Yup, 2.4 is going to be massive. It's going to be the biggest patch for mods since 2.0. There are going to be a lot of broken mods. People really want to be on the lookout for updated versions as quickly as the authors pump them out, so you aren't scrambling on patch day itself. A number of authors already have updates available (some of them as "beta" versions) which you can help them test on the PTRs to help make sure they'll be gtg when it goes live.
It's gonna be another wild ride though.