Symfonia has issued on their official web page, as follows:

Tolkki – Matos – Kusch – Kainulainen – Härkin, none of these musicians need an introduction.

They are all legends among the melodic metal community. By sheer coincidence, they all found themselves living on the same continent, in Scandinavia. They decided to join forces and express their talents in the form of a new melodic metal project: SYMFONIA.

Honoring the heritage of their previous bands Stratovarius, Helloween, Angra and Sonata Arctica, SYMFONIA continues their superb melodic metal tradition with an incredible musicianship that is a match made in heaven. This is a force that no serious melodic metal fan will be able to ignore.
SYMFONIA will make its World Premiere 18.2 at the Finnish Metal Expo, an International Metal Meeting, where they will take the stage at 11PM in the evening.

The recordings for the debut album of SYMFONIA will start in November at Studio Mega in Sweden, for a Spring 2011 release.

Source: http://www.symfonia.fi/