Reports are sweeping across the various tech blogs this morning, confirming that a new firmware update for the T-Mobile G1 is now available. So far limited to the US, the RC33 G1 update has already made its way to a handful of G1 owners.

It is not currently known what new features this new update contains, but it has been confirmed that this isn’t the much anticipated ‘Cupcake’ update.

“To ensure a great experience with the T-Mobile G1 with Google, customers with these devices will receive an Over the Air (OTA) update to their devices between February 5 and February 15. This OTA will include new system enhancements such as the ability to save pictures or files to file by long-pressing an item, check for system updates, and use the Google Voice Search feature. The OTA will also fix a number of known issues. New G1 activations will receive the OTA up to three days after service has been activated.”

In the past, the UK G1 update has followed the US release so hopefully we should expect to see an RC 9 firmware update over the coming weeks.

Stay tuned for more on this new update as soon as we get it.