Additional info in the link above regarding more than just University Life and the 70s, 80s & 90s Stuff pack. In June there will also be another EP called Island Paradise, and another Stuff Pack themed after iconic movie moments.
There was a webcast yesterday that suggested a third expansion during 2013. This may have been a slip of the tongue so I'm not going to put too much stock into that until they announce something. That said, there were three expansions last year with two having been released within a month and a half of one another, so this being EA it wouldn't surprise me if they continue along those lines as a means to drum up some relatively certain revenue.