Regarding Rogue:
After testing the rotation of several Rogue combinations for a bit, I can attest that Energy issues are pretty severe (except for /W as was already mentioned).
Hence my following suggestion. Change Numbing Dagger (a skill nearly noone ever uses anyway) to
Cursed Blade: "Sap the vitality of your foe causing 400% mainhand weapon dps physical damage to the target and restoring 50 Energy to you." 8 seconds cd and doesn't cause a gcd.
This would be akin to Warlock's Heart Collection Strike and would help sustaining a lot. The Rage sustain issues Warrior and Champion had were addressed long ago, so it would be just fair. If any balancing issues should arise in the aftermath, small corrections can always be applied to the respective secondary classes. Afterall, classes should have a somewhat fluent rotation. I can imagine that especially new players who lack elite skills will have a hard time leveling a Rogue.
Regarding Druid/Warrior:
I agree with Midan, looks promising. However, I still suggest removing the gcd of Heart Piercing and adding it to Slash.
The reason for this is that the non gcd ability is used first and having one that costs Rage just feels so clunky to play. Moreover, it would help with Rage sustain quite a bit, since Heart Piercing is used every 1.5 seconds and generates Rage constantly.