The Inception facebook page came to life after a 2-year gap, posting:
The only reason for this sudden post seems to be that an announcement for Inception 2 is about to come. Christopher Nolan's next project hasn't been announced yet and now there is a strong possibility that it is Inception 2. The tagline, which goes along with the photo, also suggests a sequel.
Inception, starring Leonardo DiCaprio, Ellen Page, Joseph Gordon-Levitt and Tom Hardy, was a critical and commercial success and it isn't doubtful that a sequel for the hit 2010 will be produced. Again, this might be just a pull on the leg, but considering that the main cast of Inception isn't very busy right now and that Christopher Nolan's next movie hasn't been announced yet, we might have the Inception sequel on the cards.