just one word: awesome!
There had been a lot of services (either offered by Flickr or outside of it) that tried to give Photos more exposure and let one sell his/her photos, but I think a partnership as this is going to hugely improve the situation, if so, just by the name that u can say, hey I have been with Getty Images.
As usual, there should be two different kind of people approached: Those that do photography already as business (as Flickr has addressed) and who will take it as another way and those that do it as a hobby and get some recognition.
For Flickr itself it is a perfect marketing solution:
1. Get a big name
2. Get more people interested in the website that seems to really have high-quality photos
3. Get people more photo eager to become part of the Getty celebration
I am definitely looking forward to that….