Yeah, I think that's about right. People will post their bfp's on 12/25 even if they get them earlier.
I dunno...people post here first, even before telling their DHs. I think they might post Dec 23 with a BFP and plans to reveal on xmas day. Also, if family is around and there is hoopla about 12/25 announcements, then people might not update the bump on 12/25. So maybe we'll have fewer xmas announcements than usual. I could just see it going either way.