I guess there will be a 1.2.4 soon, since some things still not work as they should.
Because of that, I'm also quite sure that IC2 will need some time... the new updates provide a lot of new stuff for modders and they simply have to adopt to these changes first. I guess the actual IC2-Beta is more or less a playground to figure some things out.
It will be a small change probably requiring only a hour or two of work to update stuff.
I updated by mod (1.0 -> 1.1) in like 2 minutes (but it only had about 5 base file mods).