This one came in as a rumor on rockbandaide.com, and is supported by a photo of the Rock Band Store.  Looks like we're getting an anti-Valentine's Day pack of songs, including Meat Loaf!:
 

"Yesterday we got wind of a rumor that a track from Meatloaf would be appearing as DLC next week in Rock Band 3. Now it appears that an error in the European Wii store may have inadvertently leaked next week’s DLC announcement early. While this is still a rumor until Harmonix officially announces the DLC, it does corroborate the Meatloaf rumor. The rumor does not include an indication on what songs may have Pro-Guitar/Bass charting.

• Animotion – Obsession
• B.O.B. feat Hayley Williams – Airplanes
• Bonnie Tyler – Total Eclipse of the Heart
• The Human League – Don’t You Want Me
• Lady Antebellum – Need You Now
• Meatloaf – Paradise By The Dashboard Light
• Stevie Nicks – Stop Draggin’ My Heart Around"

Holy fuck Meatloaf.

I might download the whole group of songs, but of them I'm only REALLY excited for "Don't You Want Me." The Human League is awesome.

I saw the Meatloaf rumor on RockBandAide, but was kind of hoping for a full blown Meatloaf pack.  I'll just wait for the announcement on Friday and if this is correct, listen to some of the other songs next week when Youtube users start uploading videos of the DLC.

" I might download the whole group of songs, but of them I'm only REALLY excited for "Don't You Want Me." The Human League is awesome. "

I've been wanting Don't You Want Me since RB3 came out.