Canon have announced updates of the G12 and S100 Powershot cameras to the G15 and S110 models. These cameras are of significant interest to serious photographers since they both offer RAW capture as well as JPEG. RAW files allow significantly more post exposure manipulation than RAW files, including the ability to do such things as change the white balance setting, compensate for under and overexposure, adjust the noise filters etc.
The major feature on the G15 is a faster lens. The G12 had a 28-140/2.8-4.5 zoom (in 35mm full frame equivalent terms), while the G15 has the same focal length range but is 1 1/3 stops faster at f1.8-f2.8. Canon comment that it's "...great for low-light shooting or dramatic shallow depth of field..", but take that with a grain of salt. Yes, it is better for low light shooting, but even with a fast lens you're not going to get with a small sensor camera. In fact, with an approximate "crop factor" around 4.6 for the 1/1.7" sensor of the G15, the G15 lens wide open (f1.8) at its wide angle setting (6.1mm = 28mm in FF 35mm terms) gives you about the same DOF as a 28mm lens on a full frame camera at around f8. Hardly a recipe for a "dramatic shallow depth of field". Of course the same applies to every other small sensor compact digican too.
The G15 also has a new sensor. The G12 had a 10MP back illuminated CCD, while the new G15 has a 12.1MP CMOS sensor. What difference that makes to image quality and ISO noise remains to be seen. The G15 add 1080HD video, a larger LCD (3" vs. 2.8"), a popup flash (the G12 flash is fixed in the camera), extended ISO range and faster AF. ISO on the G15 is 80-12800, while on the G12 is's 80-3200, with ISO up to 12800 available but only in a lower (2.5MP) resolution mode.
However not all the changes are positive since the G15 drops several of the G12's most useful features. The tilt and swivel LCD of the g12 is gone, replaced by a fixed LCD on the G15. In addition, the manual ISO dial of the G12 has also been eliminated, though a manual dial for exposure compensation remains. I've always found both of those features on my G12 to be very useful. The G15 also uses a smaller (and lower capacity) battery than the G12.
If you missed it, here's the link to my full review of the Canon Powershot G12
The table below is from Canon. The only change I've made is in the price they had for the G12 (It's technically $499 list, but sells for much less, typically around $379 at the moment).
The price of the Powershot G15 will be $499.99 and it will be available in October 2012.
The S110 is sort of a miniature version of the G15, as the S100 was a miniature version of the G12, at least as far as the internals of the cameras go. The S110 and G15 have the same sensor and the same RAW shooting capacity as well as a very similar set of software features. Where the S110 differs is in its size and weight (much smaller and lighter), it's lack of direct manual controls, it's lack of provision for an external flash. The S110 lens is 24-120/2-5.9, so it's a bit slow at the long end. The S110 does add built in Wi-Fi and a touch screen (fixed).
The price of the Canon Powershot S110 will be $449.99 and it's expected to be available in October 2012.
Here's a copy of part of Canon's Press Release: