In an effort to streamline a few things, Google has taken the 10GB from your Gmail storage and effectively combined it with 5 GB of drive storage, making your total storage amount to 15 GB of free storage. This update also means that you can optionally purchase higher number of storage tiers as well, for those who want such a thing. Purchasing more storage also means that the storage can be used for Gmail as well.
|View of the new drive storage page, showing the unified storage. Photo via the Google Drive Blog|
As of the time of this writing the change is not exactly reflecting on my Google Account, so I assume it is rolling out. Let me know of your thoughts on this.