Now that many credit cards, such as the MBNA Smart cash, have Paypass, a credit card is now one of the fastest ways to pay. I wish more stores in Canada, like in the USA, allowed signature-free swipe-only transactions. I recall Target doing this when I shopped there for purchases under $50, I can't think of any mass merchandiser in Canada that has this.

Interac used to be a very fast way to pay, but having to punch in your PIN for every transaction could get time-consuming. 

Anyways, I have no idea what Interac Flash will entail, I'm just guessing based on the name of the product.

Interac registered the InteracFlash.ca domain name just a few months ago. Their web-site so far just says "Coming Soon".