release notes

Author: mpoke

RELEASE_NOTES.md

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-<!--
-  A release notes template that should be adapted for every release
-    - release: <v*.*.*>
-    - release branch: <v*.x>
-    - the last release: <v-last> 
-    - the last release branch: <v-last.x>
--->
-
-# Interchain Security <v*.*.*>  Release Notes
-
-<!--
-  Please indicate whether this release is relevant to consumers or providers.
--->
-❗ ***Note this release is ONLY relevant to <consumers/providers>***
+# Interchain Security v6.4.0 Release Notes
 
 ## 📝 Changelog
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-Check out the [changelog](https://github.com/cosmos/interchain-security/blob/<v*.*.*>/CHANGELOG.md) for a list of relevant changes or [compare all changes](https://github.com/cosmos/interchain-security/compare/<v-last>...<v*.*.*>) from last release.
+Check out the [changelog](https://github.com/cosmos/interchain-security/blob/v6.4.0/CHANGELOG.md) for a list of relevant changes or [compare all changes](https://github.com/cosmos/interchain-security/compare/v6.3.0...v6.4.0) from last release.
 
-<!-- Add the following line for major or minor releases -->
-Refer to the [upgrading guide](https://github.com/cosmos/interchain-security/blob/release/<v*.x>/UPGRADING.md) when migrating from `<v-last.x>` to `<v*.x>`.
+Refer to the [upgrading guide](https://github.com/cosmos/interchain-security/blob/release/v6.4.x/UPGRADING.md) when migrating from `v6.3.x` to `v6.4.x`.
 
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 ## 🚀 Highlights
 
 <!-- Add any highlights of this release -->
 
-## ❤️ Contributors
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-* Informal Systems ([@informalinc](https://twitter.com/informalinc))
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+This is a major ICS release that brings a series of improvements to both provider and consumer chains. 
+
+- Remove the `VSCMaturedPackets` from the consumer module (as per [ADR 018](https://cosmos.github.io/interchain-security/adrs/adr-018-remove-vscmatured#consumer-changes-r2)). 
+- Add a priority list to the power shaping parameters. 
+- Remove the governance proposal whitelisting from consumer chains. 
+- Enable the chain ID of a consumer chain to be updated after creation, but before launch. 
+- Enable querying the provider module for the genesis time for a consumer chain. 
+- Enable consumer chains to have customizable slashing and jailing (as per [ADR 020](https://cosmos.github.io/interchain-security/adrs/adr-020-cutomizable_slashing_and_jailing)). 
+- Simplify the changeover from standalone to consumer chains by reusing the existing IBC connection to the provider.
 
-This list is non-exhaustive and ordered alphabetically.  
-Thank you to everyone who contributed to this release!
+In addition to the above improvements, this release also adds [interchain tests](https://github.com/strangelove-ventures/interchaintest) to ICS. This is an effort to simplify the testing framework and increase the confidence of ICS releases.