Only scarlet and salmon so far but I could see the butter yellow starting to peek out. Gladiolus are one of my favorite flowers. And yes, the rest of the blooms on the cut ones will open. That's what's so great about them. Next year the blooms should be twice the size as this first year.
*did not realize this before... the pic previews are a bit fuzzy but if you click on the pics and open them they are crisp.