Microsoft has not shared any information on this years Build developer conference yet. Nevertheless today there has been a leak by WalkingCat on Twitter revealing Build to be held in Seattle from May 7-9.
The schedule of the conference is always published just a couple of days ahead of the event but Microsoft will likely talk about upcoming AI and Azure developer features and also about next Windows 10 releases.
The date of this years Build Conference is really interesting because at quite the same time from May 8-10 Google is holding its I/O Developer Conference. This means developer have to decide which event they want to attend.