Microsofts Joe Belfiore announced the delay at a media event at Windows Build 2015 in San Francisco.
Not that Microsoft is going slow with the build releases for Windows 10.
It has already released the latest build 10074 but major changes are expected in Windows 10 build 100120. you’re free to check out the news about the Windows 10 IoT core versionhere.
source: www.techworm.net