Salesforce acquires Rebel, maker of interactive email services

I saw an early demo of this product and it was compelling. I'd never seen an email like that before. Hopefully it was a good outcome for them!

From what I recall, I could choose the size and color on a shirt directly from the email using some kind of drop-down, and when I clicked on the button to purchase, it would have the size and color pre-selected on the order form.