I thought a 1200mm equivalent lens length in the SX50 HS was pretty interesting even though I found it a bit too challenging to use. I'd love to see the next iteration of this camera have a smartphone app for remote focus/lock and shutter control. At 1200mm equivalent, I found the image to be too shaky even with IS on when handheld but on a tripod, the image could be stabilized. However, since I had to depress the clunky shutter button, there was no way the image would stay stable. A remote triggering via phone would be great.
The SX50 takes the Canon E3 plug (like the Rebel/xxxD bodies). There are wired (Canon, 3rd party) and wireless (3rd party, including a smartphone option, IIRC).