[WIP] add v8.5.7 release notes

releases/release-8.5.7.md

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+---
+title: TiDB 8.5.7 Release Notes
+summary: Learn about the features, compatibility changes, improvements, and bug fixes in TiDB 8.5.7.
+---
+
+# TiDB 8.5.7 Release Notes
+
+Release date: xx xx, 2026
+
+TiDB version: 8.5.7
+
+Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-tidb) | [Production deployment](https://docs.pingcap.com/tidb/v8.5/production-deployment-using-tiup)
+
+## Features
+
+### Scalability
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### Performance
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### Reliability
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### Availability
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### SQL
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### DB operations
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### Observability
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### Security
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+### Data migration
+
+* Placeholder for feature summary [#issue-number](issue-link) @[pr-author-github-id](id-link) **tw@xxx** <!--1234-->
+
+    Provide a concise overview of what the feature is, the value it offers to users, and include a brief sentence on how to use it effectively. If there are any particularly important aspects of this feature, be sure to mention them as well.
+
+    For more information, see [Documentation](link).
+
+## Compatibility changes
+
+### Behavior changes
+
+### MySQL compatibility
+
+### System variables
+
+| Variable name | Change type | Description |
+|--------|------------------------------|------|
+|  |  |  |
+|  |  |  |
+|  |  |  |
+
+### Configuration parameters
+
+| Configuration file or component | Configuration parameter | Change type | Description |
+| -------- | -------- | -------- | -------- |
+|  |  |  |  |
+|  |  |  |  |
+|  |  |  |  |
+
+### System tables
+
+### Other changes
+
+## Improvements
+
+## Bug fixes