Earlier today, Microsoft rolled out Windows 10 Build 14257 for fast ring Insiders. After the roll out, company has pushed a minor update to Mail & Calendar, OneNote, People and Camera apps in Windows 10 Store. It is worth to mention, the update seems to be available on Windows 10 Insiders build.
The update seems to be a preparation of a major updates or it just a update to kill bugs, which were effecting users. Microsoft always listen to our feedbacks, do let us know if you notice any differences in these update, in comments below: