The rumor is official, but it's coming early.  From hmxhenry on rockband.com:

Hey gang,

Early DLC announcement this week! You're getting the announcement early because you're getting this DLC early on account of the fact that it's a Valentine's Day pack and we wanted to make sure you had it in advance of the special day! This is the first time that we've been able to release content early on all three systems worldwide, so we're really excited about that. Enjoy!

Please note: The content releasing this Friday, Feb. 11 will take the place of content that would have released Tuesday, Feb. 15.

Available on Xbox 360, Wii and PlayStation®3 system (Feb. 11):

• Animotion – “Obsession”
• B.o.B. (featuring Hayley Williams) – “Airplanes”
• Bonnie Tyler – “Total Eclipse of the Heart
• The Human League – “Don’t You Want Me”
• Lady Antebellum – “Need You Now”
• Meat Loaf – “Paradise by the Dashboard Light”
• Stevie Nicks – “Stop Draggin’ My Heart Around” X

(All tracks are original master recordings)
(These tracks will be available in Europe on PlayStation®3 system Feb. 11)

These tracks will be available for purchase as individual tracks and as “February Heartache Duets’ Pack” 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.

Blah.... They could have given us better.  I'll have to check out RBN.

Pass for me. Only one that interests me in the slightest is the Stevie Nicks song, but not enough to buy it.

This is actually a surprisingly great pack.  I'll have to check out at least a few of these.

Oh dude, Don't You Want Me made me miss that Total Eclipse of the Heart is in the pack too.

Wasn't really sure about how I'd feel about the pack as a whole (though Meat Loaf was a guaranteed purchase), so I waited for videos on Youtube.  Bought the whole thing and didn't feel at all disappointed by it.