I think it was december 2012 - I doubt Unity 5 will be released before the 4th quarter but I guess there will be a beta starting in summer.
Funny thing is no word about a new GUI system. Maybe it will really find its way into 4.5?
This is from an article on a single, random website, with no attribution to where they got the information. It could be that they know something that everybody else around here doesn’t, or it could easily be that they heard a rumour and wrote an article without checking it, or even that they just decided they wanted some extra web traffic and made the whole thing up.
Always possible - Polygon is usually pretty good about only reporting real things, but nobody is perfect. It’s also possible it was a behind-closed-doors thing their source was shown at GDC, or something they got the scoop on that isn’t slated to be officially announced until later this week.