To be clear: there is no travel mount included with this bundle, it is just war-steed cosmetics!
The “Bone Set” has been available in the LOTRO Store in the past and has come and gone without announcement. This month it is is available until October 31st, 2013!
The default coloring on this steed is the purple color seen on the horse on the right. in the screenshot above. The purple parts are what can be dyed on the horse. Below is a picture of the Bone Set with rust dye applied.
This is a war-steed only set and sells for 995 Turbine Points in the store.