Breakpoint is going to be a purchasable skin from the cash shop. It will be similar to the Fallen Love Ranger and Inferno bundles, which included a skin, another item (likely the Back Bling in Breakpoint's case), and 1,000 V-Bucks that can be earned by completing challenges. This has generally cost $19.99 USD. Here's the official description:
Start a digital revolution and take on Breakpoint's challenges to earn up to 1,000 V-Bucks!
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Attachments are items that come with a cosmetic when a particular one is purchased.