I was theorycrafting with my group last night on how the upcoming changes to pet damage scaling will change our petsorc builds, if at all. If the changes do come down as proposed and we do need to add more spell damage to our builds, one solution we came up with would be to run Rattlecage on weapons/jewelry.
Why Rattlecage?
It will give approximately 400 or so raw spell damage with the updated stats (maybe more, I haven't done the exact math), and you also get 100% uptime on major sorcery. Generally speaking, there are better sets to give you raw spell damage, so the major sorcery isn't considered a great 5th armor piece bonus. However, on a petsorc, where your skill slots come at a higher premium, the saved skill slot could be pretty useful. Now, instead of slotting up critical surge or degeneration to get major sorcery (or using expensive pots - which I don't do on my petscorc), you just have it innately, allowing you to take an extra damage skill.
If I do end up using the set post-patch, I know I would probably replace crit surge with mages wrath, which would increase my DPS in execute phase as well as make my petsorc into an even better crowd wrecking machine!
So the improved rattlecage may not be considered a great mag DPS set in most situations, but I do think it will warrant some consideration on a pet sorc post-patch.