From hmxsean on rockband.com:
 
"What a week - Tom Petty, Fleetwood Mac, Billy Idol, Jet. We are not screwing around. We also have a ton of catch-up going on the Wii. And a couple new ones for Unplugged. How do we do it? We'll never tell. I'm off to go play some "Runnin' Down a Dream".

Tracks available on Xbox 360 (Aug. 25) and PLAYSTATION 3 system (Aug. 27):

• Billy Idol – “Mony Mony”
• Billy Idol – “Rebel Yell”
• Fleetwood Mac – “Don’t Stop”
• Fleetwood Mac – “World Turning”
• Jet – “She’s a Genius”
• Tom Petty – “I Won’t Back Down”
• Tom Petty – “Runnin’ Down a Dream”

(All tracks are original master recordings)

These tracks will be available for purchase as individual tracks on Xbox 360 and PLAYSTATION 3 systems.

Price: $1.99 USD, £.99 UK, €1.49 EU (160 Microsoft Points for Xbox 360) per track

Wii Additions

Additionally, Foo Fighters tracks “All My Life” and “Lonely As You,” from the band’s Grammy Award-winning fourth album One by One, as well as “I’ll Stick Around,” from the band’s self-titled 1995 debut album, will be available in the Wii Rock Band Music Store. Also for Wii is Blind Melon's breakthrough 1992 single “No Rain,” as well as “I’m Shipping Up to Boston” by Boston punk favorites Dropkick Murphys, which was featured on the band’s album, The Warrior’s Code, and in the soundtrack to Martin Scorcese’s Academy Award-winning film, The Departed. Songs from British rock groups Blur and Kaiser Chiefs, as well as alternative rock band Eve 6, will also be available Aug. 25, as will back-catalog tracks from Gratefu l Dead, White Zombie and others. These tracks come from the catalog of Rock Band music already released to owners of Xbox 360 and PLAYSTATION 3 system. With the addition of these tracks, there are now more than 500 tracks in the Wii Rock Band Music Store.

Additional tracks available for Wii (Aug. 25):

• Blind Melon - “No Rain”
• Blur - “There’s No Other Way”
• Dropkick Murphys - “I’m Shipping Up to Boston”
• Eve 6 - “Inside Out”
• Foo Fighters - “All My Life”
• Foo Fighters - “I’ll Stick Around”
• Foo Fighters - “Lonely as You”
• Kaiser Chiefs - “I Predict a Riot”
• Belly – “Feed the Tree”
• Ghost Hounds – “Wind Me Up”
• Godsmack – “I Stand Alone”
• Grateful Dead – “Cold Rain & Snow”
• Grateful Dead – “Doin’ That Rag”
• Grateful Dead – “Don’t Ease Me In”
• Grateful Dead &nd ash; “Fire on the Mountain”
• Grateful Dead – “Hell in a Bucket”
• Grateful Dead – “Uncle John’s Band”
• James Gang – “Funk #49”
• Mute Math – “Typical”
• Rob Zombie – “War Zero”
• Turbonegro – “Wasted Again”
• White Zombie – “Black Sunshine”
• White Zombie – “More Human Than Human”

Price: $2.00 USD, (200 Wii Points) per track

Rock Band Unplugged Tracks for PSP®System
Rock Band Unplugged fans will enjoy the addition of The Zombies’ “She’s Not There” and White Zombie’s “Black Sunshine” to the 33 tracks already available via the Rock Band Unplugged in-game music store for the PSP® (PlayStation®Portable) system.

Tracks available for Rock Band Unplugged (Aug. 27):

• The Zombies – “She’s Not There”
• White Zombie – “Black Sunshine”

Price: $1.99, £.99 UK, €1.49 EU per track on the PSP system
** Dates for Rock Band game tracks are tentative and subject to change. **"

Good songs!  I'd really like "Cold Hearted Bitch" from Jet and "American Girl" from Tom Petty at some point, but I've been waiting for "Running Down A Dream" for awhile.  Since I refilled my points balance to get Shadow Complex, I might go ahead and get that track.

I was just about to put this up ;) 
 
But, wow, that is a great list. I am 100% getting "Runnin' Down A Dream." It was actually a reason I wanted to get GH5. I guess that isn't happening.

YES!! More Fleetwood Mac = Instant buy!
 
Kind of iffy about the Jet choice, though it's not bad. I would prefer more stuff from Get Born, but I'll still buy this. Great Billy Idol choices too, which I'll also buy!
 
This is an amazing week, and will definitely help bring up my spirit since school starts on Monday. :(

FLEETWOOD MAC = Win.
 
Don't, stop, thinking about tomorrow.

Both Tom Pettys, both Fleetwood Macs and Rebel Yell are all definites. Think I can live without Mony Mony though, and that Jet one doesn't mean anything to me. I'd love to see the whole of Rumors on there but it looks like we're just gonna get bits and bobs here and there. Still, can't complain.

Wait for me to catch up until you release amazing songs, Harmonix!