Cat's out of the bag, it seems. Remember that macOS Sierra update that arrived on October 24th? It turns out that the code contains hidden images of the widely rumored next-generation MacBook Pro, and they're revealing enough to confirm more than a few details. Assuming this represents the finished product, you'll get an OLED touch strip (possibly called the Magic Toolbar) with an embedded Touch ID fingerprint reader. Not surprisingly, the reader would be useful for macOS' Apple Pay support -- you'd touch your laptop to quickly check out at a web store instead of authenticating with your iPhone or Apple Watch.