Apparently the "Steemit" logo has changed, but the "Steem" logo remains the same.

Steemit gives people a powerful voice. We help them tell and spread their stories by providing an economic system with incentives that reward valuable contributions. Our new logo is a nod to the community, the conversations, and the powerful voices we aim to amplify.

The Steem logo remains unchanged, and will continue to be the logo for the Steem blockchain and STEEM currency.

https://steemit.com/logo/@steemitblog/the-new-steemit-logo-is-here