Yes, the site logo changed. This is because site stylesheets are all brand-spanking new, and we have 15 new themes for you to choose from! More info here.
Policy Update - Rules changes incoming for AI content - Read Here
If you want you can post your art in this [thread](/forums/pony/topics/want-a-comment-on-your-pony-art-come-here-no-nsfw?post_id=5300477#post_5300477).