Here I will explain what things need to verify while accepting new test build from the developer side.

1. Build Version#: Every build has a unique no. to differentiate from other builds and tester gives test result against that build no.
2. Resolved Issues notifications for this build either by in release mail or just by marking resolved to fixed issue for that accepting build in bug tracker tool.
3. Coming new functionality notification in release mail and that should be matched with test plan.
4. Complete Path to checkout code or web url of test environment.
5. All Login Credentials
6. Changed requirement notification so tester can update their test plan and test cases as well.
7. Details about any existing blocker or Critical issue with brief description why its not fixed in current build.

I try to cover all things above that need to know before start testing on new build, Please share if I missed there that need to be included too.

Thanks !