first, about 50D noise: DPR uses ACR, which was proven to make all 50D images noisier than they should have been. I don't know if that's been fixed yet since I don't use ACR or a 50D. with DPP or other RAW converters, the noise handling of the 50D vs the 40D is a lateral move. that said, I think the 50D exhibits a bit more chroma noise than expected...but that's an easy fix in post without loss of detail.
back to the 7D:
badly translated chinese press release:
http://www.canonrumors.com/2009/08/eos-7d-press-release/#more-2538
I would wait for the english release before seriously reading all that... some thoughts/note:
- sensor technology has improved (don't people know that it always improves? pixel density is not everything), and Canon claims that the redesign boosts SNR, among other things. ok, to be fair, they always claim that.
- it is 1.6 crop, and Canon seems committed to APS-C since, according to the translation, the 7D is considered the "flagship" for APS-C cameras.
- viewfinder is now the same as the 1DIII's...meaning not that much bigger. but everyone should have expected that since the sensor/mirror's so small compared to APS-H and 35mm.
- 5 (or more?) AF modes, improved tracking/auto AF point selection. I've never used a 1D so I don't know how they compare.
- remote flash triggering, finally
- more and more customizable Picture Styles, for the Jpeg shooters
- shutter press feels more like 1DIII and 5DII? I guess that just means a softer half-press
- power switch location is changed, no idea why they bothered
Oh please, the 15MP 50D is already a piece of crap at ISO 800 and beyond, don't insult my intelligence by telling me this camera will be capable of ISO 12800
capability and whether it'll be any good at it are two separate things. P&S' regularly go to 3200+. other than that, see my above comments on DPR/ACR and the 50D.