Yeah, in fact the website says "Try it in Gemini" and I'm not sure if I'm already trying it or not - if I choose Gemini 2.5 Flash in the regular Gemini UI, I'm using this?

It’s going to be a messy rollout as usual. The web app (gemini.google.com) shows “Images with Imagen” for me under tools for 2.5 flash but I just tried a few image edits and remixes in the iOS app and it looks like it’s been updated to this model.

Also very confused at this... It told me "I'm unable to create images of specific individuals in different settings." I wish it would at least say somewhere which model we are using at the moment.

I think not. Because at least in the aistudio there is a dedicated gemini-2.5-flash-image-preview model. So I am assuming it is not available in the standard gemini chat window.