On the outside, the new Canon PowerShot SX40 HS doesn't look any different than its predecessor, the SX30 IS. In this case, it's what's inside that counts.
While other camera manufacturers had started using backside-illuminated (BSI) CMOS sensors in their higher-end 2010 compact cameras, Canon stuck with a 14-megapixel CCD for SX30. That changes with the SX40 HS getting the same 12-megapixel BSI CMOS that's in Canon's Elph HS models, which so far has proved good for improving shooting performance and low-light photo quality.
On top of the new sensor, this camera gets a new Digic 5 processor that promises to improve color and noise as well as contributing to faster burst shooting and full HD movie capture. For example, Canon claims its new High-speed Burst HQ option will allow the SX40 to shoot at up to 8 frames per second at full resolution.
There are a couple other new features like Intelligent IS image stabilization that uses your shooting conditions to determine how best to use the optical IS system. But otherwise, the camera is unchanged from the SX30 including its 35x, f2.7-5.8, 24-840mm lens.
Specs and marketing hyperbole are available on Canon's site. Look for the SX40 HS to hit stores in late September for $429.99.