The Joomla project has released Joomla 2.5.28 that has been tagged as the last release in the Joomla 2.5 series.
Officially, as of December 31, 2014, the Joomla 2.5 series will no longer be supported. This means that there are no new releases planned for Joomla 2.5, as the Joomla project is putting all its efforts in its Joomla 3.3 and upcoming 3.4 series.
We have tested Community Builder 2.0.4 and it works just fine with this new Joomla release.
There are no security related fixes in the Joomla 2.5.28 release, so there is no real rush to upgrade. However as this is the last of the Joomla 2.5 series you should start planning to upgrade your Joomla 2.5 websites to the even more secure, feature rich and mobile ready Joomla 3.3.6 environment. From January 1st Joomla 3.X will be the only security maintained release.
As developers of the most popular Joomla Social Networking extension, we are always here to help out our community. In addition to the Planning for Mini-Migration - Joomla 2.5 to 3.x Joomla resource,we have compiled a detailed how to upgrade guide that includes a video tutorial of the entire process of upgrading a Joomla 2.5.28 site with Community Builder 2.0 installed to Joomla 3.3.