Sounds very interesting. I like Flickr a lot for my limited tryout of their free account, but I never went to pay for the Pro account. Interested to see what improvements Yahoo does to the service…it might be enough to get me to plunk down some $$$ and sign up.
The great thing about Flickr is how open they are with their system, which allows you to do some really cool stuff like include your Flickr pictures on your blog automatically.
I hope they offer a way to buy prints of photos (like what Shutterfly offers), that is one feature I always thought was lacking with Flickr that would have made perfect sense.