From hmxhenry on rockband.com:

Available on Xbox 360, Wii andPlayStation®3 system (August 16th, 2011):

• Fall Out Boy – “Dance, Dance”
• Fall Out Boy – “Sugar, We’re Goin’ Down” X
• Fall Out Boy – “Thnks fr th Mmrs”
• Deep Purple – “Child in Time”

(These tracks will be available in Europe on PlayStation®3 system August 17th)

The 3 available Fall Out Boy tracks will be available as “Fall Out Boy Pack 01”, and all tracks will be available for purchase as individually on Xbox 360, PlayStation®3 system and Wii. Tracks marked with “X” will include Pro Guitar and Pro Bass expansions for $0.99 per song.
Price:

• $5.49, £2.49 UK, €3.99 EU (440 Microsoft Points, 550 Wii Points™) for “Fall Out Boy Pack 01”
• $1.99 USD, £.99 UK, €1.49 EU (160 Microsoft Points) per song
• $2.00 USD (200 Wii Points™) per song
• $0.99 USD (100 Wii Points/80 Microsoft Points), £0.59 UK, €0.79 EU per song for eligible Pro Guitar/Pro Bass upgrade

Who names their song "Thnks fr th Mmrs?" Lame week.

Child in Time is likely going to be my only purchase this week.

Ok, I understand the need to keep diversity in the Rock Band library...but even more Fall Out Boy?

Um. So what's on RBN this week?

 Oh Rock Band, you  lure me in again with Def  Leppard only to massively disappoint  a week later.  
 

Child In Time is one of the best songs ever and needed to be in Rock Band.

God just give me the RHCP tracks already

sweet Harmonix in time... you'll see the line...

the line that's drawn between... good AND BAAAAAAD