by: Wilson Rothman | Today

In an appearance Tuesday on TODAY, Twitter CEO Dick Costolo revealed a new look for Twitter's profile pages. The fresh take won't just be seen on twitter.com, either, but will be visible on mobile apps as well, including Twitter's all-new, totally rebuilt iPad app.

What's the biggest change? There's now a huge header image that runs across the top, sort of like the banner image that Facebook users have on their timelines.