Interesting, was this a re-direct I wonder or just trolling for personal info? I have several Firefox addons that are supposed to alert for redirects to fake sites, but I noticed nothing yesterday.
Not sure either but wasn't going to take any chances.
If you want to see what it looked like this post from the front page article thread has a picture of the same box I saw at about 2pm (UK time) on Monday.
https://forums.macrumors.com/threads/1670588/