Rock The Nation has recently confirmed Kivimetsän Druidi for MetalFest 2011.

So far, these bands have been confirmed to play next year:

Sabaton, Cradle Of Filth, Arch Enemy, Equilibrium, Sodom, Watain, Rage, Eisregen, Destruction, Arkona, Belphegor, Suidical Angels, Kalmah, Milking The Goatmachine, Thaurorod, Kivimetsän Druidi, Excrementory Grindfuckers, We Butter The Bread With Butter (Austria only), Neaera (Austria only)

Metalfest Germany again will take place at airport Dessau, Metalfest Austria will happen in Mining am Inn and Metalfest Switzerland in Z7 in Pratteln, all at the same time from May 27 – 29, 2011.

Source: http://www.metalfest.eu