Microsoft unintentionally announced the release date of Office 15 suite. An official roadmap for Office 15 is found on Dutch Microsoft site by Maarten Visser. He also explained how he found the roadmap with a video on YouTube. According to the Microsoft roadmap SharePoint 15 Beta will be released in the mid of this year and final version will be released in the first quarter of 2013. I was shared the link of SharePoint 15 SDK. Maybe now it’s time to be prepared to develop applications or web parts on new version of SharePoint.