The latest rumors surrounding HTC's next flagship device, the HTC One M9 or HTC Hima as it's being referred to in the tech community, are suggesting that we'll potentially see it come packing a 20MP camera, which would be a significant improvement over last year's flagship device, and even an improvement over the rear facing camera on the more recently released HTC Desire Eye which sports a 16MP camera on the back. More specifically though the rumor is focused on the type of image sensor used, which states that the 20MP camera sensor could be produced by Toshiba, and that it could be the T4KA7 model sensor, which sports a 1/2.4 aperture and is currently undergoing development.
Other rumors have previously suggested that the HTC Hima could come packed with a Sony 20.7MP IMX220 Exmor RS sensor inside, so either HTC may be planning to place a different sensor in a separate variant, or they may have originally decided to go with one sensor type and then changed their minds. The IMX220 has a slightly bigger pixel size, as it's listed having pixels measuring at 1.2 micrometers while the Toshiba T4KA7 features a pixel size of 1.12 micrometers, which could point to the Sony sensor having the capability to produce a better quality image. However this is just a rumor at this point and no statements from HTC have been made official. Nor have their been any leaks of the device just yet displaying the camera and the sensor type.
HTC's One M7 device used multiple camera types, so HTC could in fact be going with a different sensor for multiple variants. For clarification, the Sony sensor listed here is the one found in the Sony Xperia Z3 and Xperia Z3 compact, as well as the Meizu MX4 Pro, while the Toshiba sensor is listed as still being in development on Toshiba's own website, so there's no telling whether or not the sensor could be ready in time to ship with HTC's new device. We're sure that either camera would be a great choice for HTC compared to their past camera units, but for now we'll have to wait until some more concrete evidence shows up to give us a better idea of what we can expect.