Google has finally integrated storage between its three most data-intensive consumer platforms: Gmail, Google Drive, and Google+. The result? 5 extra GB of total Gmail storage, and 15GB of shared space among the three. This means you're no longer limited to 5GB of Google+ / Drive space, but all three services will now share the same "bucket."
For hardcore Gmail addicts, this comes with an added bonus: all Google Drive storage tiers now apply to your Gmail storage cap.