"Remember when Twitter used to be about WORDS?"
That statement will be the next "Remember when MTV used to show VIDEOS?"
Twitter has begun rolling out a feature where pictures posted to your account will show up in an online gallery associated with you in order to display your creativity or something. It will show only the last 100 photos, pulling them from either Twitter's own photo client, TwitPic, or yFrog. Presumably, the ability to curate albums on your own will come along later. The new design feature will be rolled out little by little over the next few weeks.