Recent information has leaked from next month's CoroCoro Magazine issue. The cover featured a silhouette of a new Generation VI pokemon. Within the magazine, it is revealed that Ninfia (ニンフィア) is the silhouetted pokemon. Ninfia is confirmed to evolve from Eevee; type and method of evolution are currently withheld.
What type do you think it is? How will it evolve? Let the speculation begin!
http://www.serebii.net/corocoro2130.jpg
http://www.serebii.net/ninfiath.jpg
Edit: New information has surfaced, Ninfia's English name is revealed to be SYLVEON.