Direct from the SXSW site:
SXSW Music is excited to announce our first round of bands who will be performing at SXSW 2010!
* Giulia y los Tellarini; Barcelona, Spain
* The Hong Kong Blood Opera; Hermosillo, Mexico
* Archie Bronson Outfit; London, England
*The Temper Trap; Melbourne, Australia
* Japandroids; Vancouver, Canada
* CHEW LiPS; London, England
SXSW says all acts will be notified by January 29, 2010 of their status for the 2010 festival.
