Eyonix from Blizzard made the following comments on the Warlock class and potential upcoming changes:

I've spent a great deal of time gathering player feedback from this forum (some really amazing feedback!) and I wanted to take a moment and share with you what I've discussed with the developers. I know that the information below does not address every concern that has been expressed by Warlock players, however, I feel that it's a good start, and should only demonstrate the standard at which I plan on updating you guys with news and information. So please take a moment to read, enjoy, and discuss.

I realize that Soul Shards have been a hot topic amongst Warlock players, so I wanted to address them first. Soul Shards are intended to take up inventory space as we want players to strategically manage the number of shards they carry at a given time. However, we do realize that the system as it currently stands is a bit cumbersome and we're investigating the possibility of making the necessary improvements. While we're not dedicated to any one decision, the developers are seriously considering the possibility of introducing unique Warlock specific bags designed to carry Soul Shards. This change is not definite, however improvements in this area are in the works and an update will be provided as soon as I have additional information.

The complete acticle can be read here