The latest standard of C++ called C++23 was officially released and published in October 2024. The next version, often referred to as C++26, is in the draft stage and is expected to be finalized after resolving ballot comments at a November 2025 meeting. There is no separate "C++" release expected specifically this month (September 2025) as C++23 is the current official release and C++26 is still being worked on. However, ongoing C++ conferences and events with discussions and presentations about C++26 and current features are happening around this month, such as CppCon 2025 and ADCx Gather. So, in summary:

• C++23 is the latest official release (October 2024).
• C++26 is expected to be finalized after the November 2025 meeting.
• No official new C++ version release is scheduled specifically in September 2025.
• C++ community and conferences remain active this month discussing current and upcoming features.