From the article:

> Starting today, Bard will use a fine-tuned version of Gemini Pro for more advanced reasoning, planning, understanding and more.

Additionally, when I went to Bard, it informed me I had Gemini (though I can't find that banner any more).

The Bard responses in the chat have a little icon next to them on the left. Mine still says PaLM2, so I'm assuming no Gemini here. (UK/Firefox)

I think Gemini Pro is in bard already? So that's what it might be. A few users on reddit also noticed improved Bard responses a few days before this launch

the new model is live