See also:

TeamCity 9.1 Release Notes

Feature

Usability Problem

Bug

Exception

Performance Problem

Security Problem

The issues will be made public in several weeks

<ul><li><a href="http://youtrack.jetbrains.net/issue/TW-42036">TW-42036</a> - It is possible to get password field values for build features and steps via REST API</li></ul>

Cosmetics