Even if you don't get shadowmourne, and its unlikely unless you are a hardcore raider on one char, its worth getting at least the pre-shadowmourne (shadows edge or something?) weapon and its (relatively) easier.

Step 1 requires you to get to friendly, just farm ICC10 trash.
Step 2 requires 25 primordial saronite (23 x25 badges or a lot of gold and trade/AH) and some other minor things
Step 3 requires you to kill boss 7 & 8 in wing 2 of ICC25 (opens Jan 4th or so?)

Once you finish all of these steps you get a ilevel 264 2h axe with very nice stats for a warrior/DK. "Value" is somewhere between 50-100k gold, considering you can sell primordial saronites for 2-4k gold each. Of course, in 5 months prim saronites will be 100-300g each making the axe much, much easier and cheaper to obtain. But then again a few months after that Catacylsm will be out and you can loot a green weapon with better stats probably