The latest major new version of R, version 4.5.0, was released on April 11, 2025. This release introduced many new features and improvements, as detailed in the official news and blog posts about the update. For example, new functions, enhancements to existing capabilities, and bug fixes were included in this release. To summarize:

• R version 4.5.0 was released on April 11, 2025.
• It included many new features and bug fixes.
• Users can update R by downloading the new version from the official R project website and installing it, after which RStudio will automatically use the new version upon restart.

If the question is about a specific upcoming or newer version beyond 4.5.0, there are no confirmed releases beyond that date as of now.