Over on the Japanese Street Fighter IV blog, the team uploaded a photo of how the game used to look earlier in development.

Click image for a larger version

You can see from the image, the placement and names of the Ultra and Super meters have changed from what we currently know, and the lifebars are completely straight.

In the blog post, they also talk about the previously announced benchmarking tool for the PC release of the game and some notes about what went into developing the title, including photos of the journals they used to take notes.

Also Bez76 and Zombiebrian pointed out a video of Street Fighter 4 from back when the game only had 10 characters.