To answer your questions:
Is ViewPager deprecated in Google Glass KitKat[XE16]?
Kind of. ViewPager isn't explicitly deprecated in XE16, but it was never actually a fully supported. If you have cards of content that you'd like to flip around, use CardScrollView instead. You can learn more about using it in here.
Is there have any release note or change-log for XE16 for google glass developer?
Yup! Check out the Glass platform release notes.