Woohoo! Just as I was thinking hard about dropping my Dropbox Pro account since I could get so much more storage elsewhere, they went and sent me an email today saying that they have raised my limit from 100GB to 1TB! Wow!
They also added a number of features to make sharing more secure, like the ability to require passwords for others to download from your Dropbox. Many more changes also.
Here a link to their blog post announcing the changes: https://blog.dropbox.com/2014/08/introducing-more-powerful-dropbox-pro/