Looks like there are several new item being added in 2.4 for leatherworkers. Rogue specific are:
Carapace of Sun and Shadow
Gloves of Immortal Dusk
Info found on WowInsider.
So both of these items are going to put the Primal Strike chest and the Fel Leather Gloves out of buisness for raiding items, but my understanding is that you will need to be raiding the Sunwell to get these patterns, and the gloves require regents that are only found in the Sunwell.
I want to know why Blizz is introducing a sick new epic chest pattern that requires LWing to be 10 points lower than capped and it is better than the piece that we chose Leatherworking for.
I do see that they upped the regents for the chest from 6 Primal Shadows to 6 Primal Mights, but thats still not that bad for what you get...I will be making as soon as I can find the pattern on the AH if it is BoE.