A bit thanks to Les Sims Wiki for commenting on our earlier post!
It appears that EA actually announced Seasons last week, according to French website. They feature Sweet Treats, Supernatural, and underneath the Supernatural trailer we get the following:
Acclaimed by fans of Sims 2 in February 2007, the extension "Seasons" returns Nov. 16, 2012 in Sims3. To you, snowball fights, snow in the winter before returning to the cottage, summer water sports or lazing by the pool of your villa … watch out for sunburn!
November 16th would be the UK release! I am hoping this comes after Supernatural… is TS4 approaching faster than we expected?