Yep, I was the one who posted the 3.2.2 rotation as well.

Scourge Strike got a significant buff in 3.3 - previously it was 100% shadow damage. Now it's 50% physical & 50% shadow. This means it now scales with buffs like Horn of Winter, Blessing of Might, etc...

So becuase of the SS buff, the rotations have changed as well - 2 points now go into Epidemic, which increases the duration of your diseases by 6 seconds (from 15 to 21 secs). This in turn means that we don't have to re-apply diseases until every 2nd rune cooldown, and allows an extra SS into the rotation.

To clarify - there is nothing wrong with the 3.2.2 rotation. Thanks to the SS buff, the 3.2.2. rotation is even better in 3.3. If you're happy using it, by all means keep using it. This new rotation should offer a bit better DPS (and from that a bit better threat)

When I get a chance, I'll run some numbers from both specs and post the results.

Cheers,
S.