Its confirmed that these items will be +6 item levels above their normal /heroic counterparts, and they will drop more frequently in 25 man raids!
Yay for 25 man raiding!
Source: http://us.battle.net/wow/en/forum/topic/7709282055#1
This is a great day for 25 mans, and one step in the right direction. (although the step should be 25s drop thunderforged and 10s drop normals, but thats my opinion)
What do you think?!