Today we've seen the PTR (Public Test Realm) go down, and then come back up again. Earlier we thought this was a good indication that patch 2.4.2 was going to be released on May 6th, however with the PTR still being up, we don't believe that will be the case. Of course I could be completely wrong here – and we all might get a shiny new download screen tomorrow morning.
Only time will tell, and stay tuned to WoW Insider for the latest. We'll also keep you abreast of when the realms come back online, and any lingering issues that may arise.