I honestly don't know how I'll respond to a TESV announcement, because every day, I casually check the BethBlog;I don't even expect to see anything interesting, it's just part of my daily schedule to check the blog before I start working. When I do see an announcement, it might take me a day or two to actually notice/realize it, after which I will cry tears of joy.
I do hope that the servers don't overload with the huge influx of members on the announcement day that say things like "Who's Martin Septim?" or "This will just be Fallout with swords."
I just hope that Bethesda doesn't rush their current project (yes, I know it feels like they've been taking their sweet time, but they really haven't). I don't want another heartbreaking moment like when BioWare delayed Dragon Age from April all the way to November.