99X radio in Atlanta emailed their listeners today about a "BIG" concert announcement for this summer coming on Tuesday. 'Burn It Down' gets released on Monday 4/16 worldwide, and this announcement is the day after.
It looks like Linkin Park will hit us back-to-back days with big news - a single and then a US summer tour. Most big name concerts for this summer have already announced their tours - Dave Matthews Band, 311, Mayhem Festival, etc... It seems Linkin Park is one of the only ones left out.
EDIT: The black and white artwork behind the announcement image is from the 'Burn It Down' puzzle on LP.com. (Thanks to ivan_astahov)