Jackson is stretching the content of The Hobbit in three ways: adding extraneous characters and subplots, adding action sequences which look like they were designed to turn into video games, and supplementing basic story of The Hobbit with contemporaneous events from the Tolkien canon.
Done right the confrontation between the White Council and Sauron (in his guise as the Necromancer in southern Mirkwood) is of the last sort. The finding of the Ring occurred in the same year that the White Council “drove” the Necromancer from Dol Guludur (or more likely Sauron made a long-planned strategic retreat to Mordor).
I really wish Jackson had stuck to the canon. Adding material from the appendices of LOTR to The Hobbit is a perfectly reasonable way of handling the fact that the movies are released as a “prequel” to the LOTR movies, so we all know what it is that Bilbo found, who Gollum is, and the like, unlike folks who read The Hobbit when it was first published, then LOTR. He could have had two movies and been faithful to his source material, but no, he wanted to have three and video-game revenues, too.
That was my impression as well.