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when does ios 11 release for iphone 7
iOS 11 was officially released on September 19, 2017.
when was the public beta for ios 11
The first developer beta version was released after the keynote presentation, with the first public beta released on June 26, 2017.
where was the keynote presentation for ios 11
WWDC 2017 (stylized as WWDC17) was held from June 5 to June 9, 2017 at the San Jose Convention Center in San Jose, California

Question: what software was announced
Self-contained rewrite: what software was announced at WWDC 2017