This has been announced here and there (Baen's Bar and Teleread)
http://www.teleread.org/blog/?p=6055
but it's worth mentioning since it seems that the 2 authors were for many years big supporters of drm. However Embiid their drm epublisher died and the public made it clear they want the ebooks but drm free. I hope the experiment will be a big success and encourage more authors to try it.
The first bundle comes in mid february though pricing and other details have not yet been released.
Also the Mote In God's Eye and the whole Codominium series by Niven/Pournelle has been available for a while from Baen with no drm of course.
http://www.webscription.net/
Liviu