A somewhat vague rumor surfaced on the web stating that the successor of the Powershot SX50 HS may be announced sometime in spring and be available for shipping in the summer 2014. The camera will most probably be named SX60 HS. No specs or other information. Speculation goes to the point that the SX60 HS could feature a 100x zoom. A pertinent patent appeared some time ago, though I do not think the SX60 HS will have such a crazy zoom range.
The Powershot SX50 HS is a popular bridge camera, and indeed it is due for replacement.