I am looking for more information than the Release Notes regarding the new Concur Invoice UI. 

Per the January Release Notes, the new UI is targeted to be available for opt-in Q2 2024.

https://www.concurtraining.com/customers/tech_pubs/Docs/Invoice/_RN/2024/InvProRN_2024_01_Cli_F.pdf

I have not received any emails or any information from Concur about the new UI, new training information, what it will look like, what we can expect, etc. I only piece mailed this together after seeing the May release notes and that there are several call outs for the *ongoing* changes related to the 'new UI'.  Link to may release notes https://help.sap.com/docs/SAP_CONCUR/e44f13ccd0b04692b877e6840b47c1f7/3685d3c3de1c4287b985666c5f82b2...

Is there a new UI for Invoice? 

When can we opt in?

Are there any correspondences Concur has sent to Admins? 

When can we expect training materials to be published?