I predicted last year that Diet Coke would pass Pepsi in a year or two. It looks like it will be in 2010.
As for Coke Zero... yeah, it would definitely help if it got some fountain space at McDonald's. It would also help if Coke would stop targeting it at males... and focus on CZ's true strength--it's great taste. My guess is that Coca-Cola Co doesn't want Coke Zero competing with Diet Coke (which is so close to passing Pepsi) and so they're not benefiting from its full potential. Not to mention that Coke Zero still doesn't get enough shelf space (at least in NYC). Coke Zero is often picked over when I go shopping (with only a few bottles left on the shelf, especially after I stock up)... while Diet Coke always has plenty of product. My point being... if I go to a store and they're out of Coke Zero, I do NOT buy Diet Coke. I either buy nothing, or buy Diet Dr Pepper. Coke needs to wake-up and give CZ the respect it deserves!
As for Pepsi... it doesn't look like the new logo helped Pepsi much at all. It's market share fell almost exactly the same amount as last year.