According to IMDB, Ian McKellen and Patrick Stewart will return to the X-Men series as Magneto and Professor Xavier. X-Men: Days of Future Past will be a sequel of the X-Men: First Class. This movie will link the previous series and the First Class movie together.
This news doesn’t surprise me. As an X-Men fan from the 80’s, I am very familiar with the Claremont and Bryne storyline. The story is set in the future and the Sentinels rule the United States. Pulling the First Class to the future and they interact with older versions of themselves such as Professor X and Magneto.
I am excited about this movie but it is not released until 2014.