Grunge heavyweight Soundgarden will reunite in 2010 after 12 years apart, Chris Cornell announced via Twitter tonight at the stroke of midnight on the East Coast, confirming increasingly persistent rumors the band would reform — perhaps to headline the Coachella festival.

Cornell’s tweet reads: “The 12 year break is over & school is back in session. Sign up now. Knights of the Soundtable ride again! www.soundgardenworld.com” A similar message is posted on the band’s site, along with a vintage video of the group tearing through “Get On the Snake” from 1989’s Louder Than Love.

At this point, it’s unclear what shape the Soundgarden reunion will take — tour, new album, etc. — or if it will involve Coachella. Just so long as Timbaland’s not involved, everything should be OK.