As part of the latest Fujifilm X10 rumor, Gizmodo recently reported that a Fuji X50 camera was listed in the latest Promaster catalog. I have several readers who own the catalog, confirming to me that this was not the case and all this started as a joke on a forum. The original Fuji X10 specs I believe came from this post. The actual camera name will likely be X10 and it should be released next month. The new Fujifilm system camera with interchangeable lenses (based on the X100) will probably be released later in the year or in early 2012.
In conclusion, here is a quote from Brandon Remler (who works for Fujifilm USA):
"Clearly the advantage in my opinion (depending on your shooting style) goes to Fujifilm with the only hybrid optical viewfinder (bias alert here). Carrying that over into new models is what will set the cameras apart from the crowded field already mentioned."