Blaise Agüera y Arcas, a top engineer at Microsoft(s msft), is moving on to rival Google, The New York Times reported Sunday. Agüera y Arcas helped develop Bing Maps and the latest version of Photosynth, and worked in augmented reality  and wearable technology. Microsoft and Agüera y Arcas confirmed the move to the Times without much comment. Microsoft never likes to lose top talent but has proven particularly touchy when that talent heads to Google(s goog).