I will send a heads-up at the end of next week or when
I start building to let you know.
I finished bumping packages in git master branches
over the weekend and building for ghc-7.4.2 is now well underway.
As I write, currently about 70 packages still need building.
I think it all should be largely finished within the next day or two.
I will send out a sign-off mail when that happens.
Jens