While Capcom's official stance for both North American and European releases of the Mega Man Zero Collection are still just this summer, some online retailers are starting to provide provisional release dates for the title. In North America, June 8th appears to be the date to look forward to according to both GameStop and Amazon.com. Meanwhile, Play.com is reasoning that the Zero Collection will release in Europe on August 27th.
While these are not official still, they're probably in the ballpark.
News Credit: Protodude's Rockman Corner