I hadn’t realised this had changed either, but I worked it out.
Select your layer, click and drag to select the frames you want to change colour on, and then proceed with Change Color as before.
edit: actually, using i again later on today, i also realised that you have to have the original colour as the foreground colour, or it just will not work.
I’m preparing a fix to this (bringing back a simpler version of the button), but at the moment you can select all layers and use Replace Color to replace the color in whole sprite. (You can Shift+click the layer where you want to see the Preview too.)