Took the headline from the article, however note that as far as I can tell the real story is that a (reputable?) blog claims to have seen documentation stating that the original deal is up for review in October, not that exclusivity is definitely lost.

Interesting that T-Mobile has already started offering iPhones to select customers though: http://www.theregister.co.uk/2009/08/03/t_mobile_i_phone/