Ah, Matt McGloin at Cosmic Book News. Of course. What's happening there is that Kelly Thompson, the current writer, is ending her run as the writer at issue #50 in a few months from now. However, the Captain Marvel series will continue.
Now, Marvel Comics could decide to start a new writer's run with a new Captain Marvel #1, which is what they do with EVERY title now. For instance, Jason Aaron is ending his run as the Avengers writer this month, so next month The Avengers comic will start over with a new #1 and a new creative team. Iron Man just did that. Captain America just did that. They all do that now. I've seen no previews that Marvel Comics will start a new run of Captain Marvel instead of continuing through to #51 and beyond. Either way, Captain Marvel isn't being canceled. If anything, Marvel Comics can't cancel Captain Marvel because if they don't publish the title they will lose the copyright.