From hmxhenry on rockband.com: 

Hey gang,

Here's the DLC coming your way next week, a Ministry 3 pack! These are some solid industrial tracks to wear you out in the summer heat. Rock Band Network DLC info coming shortly!

Available on Xbox 360, Wii and PlayStation 3 system (Aug. 10):

Ministry – “Stigmata”
Ministry – “Thieves”
Ministry – “Jesus Built My Hotrod”

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

These tracks will be available for purchase as “Ministry Pack 02,” as well as individual tracks, on Xbox 360 and PlayStation 3 system, and as individual tracks only on Wii.

Price:

$1.99 USD, £.99 UK, €1.49 EU (160 Microsoft Points) per track
$5.49, £2.49 UK, €3.99 EU (440 Microsoft Points) for Ministry Pack 02
$2.00 USD (200 Wii Points™) per track

As a fan of Ministry I'm not sure if this is awesome or lame.

What  about NWO?

Meh to the rest.

I only have Cuz U R Next from them but ehh I don't think I'll be missing out on too much from them. 
 
I don't think I'll be buying any DLC for a while until RB3 comes out.  Maybe more Creedence Clearwater Revival since I only bought one of their songs so far or a little bit more Grateful Dead as well but besides that, I think I'll be trying to chill from all the DLC.