From the Classic Battletech web site comes the following information:

Catalyst has released a free PDF, Chaos Campaign, containing the Warchest Campaign Track System originally published in Dawn of the Jihad (and now found in Blake Ascending).

Additionally, the first in a new ebook series, Jihad Turning Points: Luthien, has been released (see Jihad Turning Points: A New Ebook series blog for more details). 

Finally, a free PDF containing the blank record sheets and compiled tables at the back of Tactical Operations is now available (along with a “check list” to track which rules are being used in a given scenario).