@Raymond Tang Thank you for reaching out to Microsoft Q&A. Based on a conversation with the product team, there are no plans in the upcoming quarter for Australian Southeast region. If you have interest in the region and would like to share feedback with our product team, please submit it in General Feedback so that others with similar interest can upvote it too. If you like to share details about your org/customers, expected usage etc. I can send you a message separately to collect details and submit with our product team internally.
Please feel free to follow Azure Updates and Product Updates on the latest public info on the availability. I hope this answers your question and feel free to add a comment if you have any other questions. We would be happy to assist you. Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community.