Just got the new 600EX-RT flash. First impressions are: feels very solid, not too heavy, easy to control. I like the beep function, which will be useful to know when it has fully charged when used off-camera. I plan to get 2-3 more of these along with the ST-E3RT within the next couple of months.
600EX-RT with some of its relatives, old and new:
I also got to test the new 40mm f/2.8 pancake at the store. Initial impressions are very good -- very sharp wide open, even in corners. STM isn't as quiet as USM, but better than the AFD of the 50/1.8 and 35/2.0. And speaking of the 35/2.0, it's the reason I'm hesitant to buy the pancake. The 40mm is a bit too close to 35mm, and is a stop slower. The good thing about the pancake is that it takes up almost no space in the bag when mounted, so e.g. it should be able to fit into "body-only" bags such as the ThinkTank Shapeshifter. The front element also extends when focusing (similar to the 50/1.8 and 35/2.0), so it is vulnerable to accidental knocks if you do not manually retract it after use (and a lens hood doesn't help protect it since it screws onto the moving part, unlike the 35/2.0).