Lore posted this about CB getting a slight damage adjustment.
We agree that Destruction is a bit low in 5.4. We also recognize that, particularly after the Kil'Jaeden's Cunning changes, Chaos Bolt has become a "riskier" spell to cast. To both ends, we think a Chaos Bolt buff is in order. We're going to bring it up by 15% and see where that puts things.
Our general philosophy for Destruction in 5.4 is that casting Chaos Bolt can be tricky sometimes -- working around interrupts and LOS in PvP, or sneaking them in between periods of movement in PvE -- but when the cast goes off, it hurts. A lot. We do have to be careful not to push things TOO far, but we'll see how things go from here.
This change was applied via hotfix sometime yesterday, so it should already be live on the PTR if you'd like to get some testing in.