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MicrosoftHi @Glenn, the process isn't something any of us can speed up, for GCC High once engineering releases the product it must undergo FedRamp assessment and approval, which is an independent certification authority by design. DOD releases must be reviewed and authorized by DISA.
Similarly this is why you cannot at this time add 3rd party apps to Teams either. The current approach requires that these undergo FedRamp review and approval as well and it is up to the individual app provider to undertake this process. There has been some talk about introducing a risk-acceptance model for GCC however, if this is something you'd like to see please be sure to visit UserVoice to support any existing requests or start one yourself. The more the product team hears on this the more seriously it will be considered.
As these authorities are independent of Microsoft updates to the public roadmap are not always possible until that certification disposition is communicated back to Microsoft. At that time you will typically see an update to the public roadmap. There may be some additional details available to you if your organization has an enterprise agreement with Microsoft, you only need to ask someone from your sales or account management team and they may be able to tell you more.