From a blue post:
“In addition to new items, we’re also adding a new tier of gems for those who really want to push their character farther. The new tier is called “Marquise” and most of its stats are in line with the current gem progression.
We also took the opportunity to modify the Ruby effect in weapons. At the moment, the Critical Hit damage bonus provided by the Emerald is a clear choice for anybody looking to do more damage with their weapon. The new tier Ruby is a significant bump up that should make it the preferred choice for those who favor attack speed over Critical Hit chance, or for those who use skills which do not benefit as much from Critical Hit such as Sentry and Hydra.
Players often ask why their Sentry or Hydra doesn’t inherit their Critical Hit Chance and Critical Hit Damage. The answer is that we want players to be able to build their characters in different ways, and we would rather Critical Hit Chance and Critical Hit Damage weren’t always automatically the right answer. While this is not something that will change overnight, “different stats for different builds” is a high-level design goal and introducing a very strong Ruby is a step in the right direction.”
I take this to mean that they are retuning rubies and their effects when socketed into weapons. If this is the case, and rubies are more viable as an option for damage, I expect to see the price of rubies jump dramatically a few weeks after the release of the patch. I’ve invested some of my gold into flawless rubies in anticipation of this happening. *fingers crossed*