It has been officially confirmed over on Heartagram.com that HIM will be headlining this year's HellDone festival!!
More information can be obtained here: http://www.heartagram.com/news/2009/10/14/helldone-festival-2009

Tickets will go on sale:
Oct 20th, 2009 at 09:00am in Helsinki, Finland (EEST)
Oct 20th at 02:00am in New York, US and (EDT)
Oct 19th, 2009 at 11:00pm in Los Angeles, US (PDT)