The First Order has some new heavy hardware in Star Wars: The Last Jedi
A generation later, and with the Galactic Empire now having evolved into the First Order, there has been an upgrade to the venerable AT-AT. Has the design changed much? Nope! But one of its major weak points have been modified at least. Check out the successor to the AT-AT, the beastly All Terrain Megacaliber Six. Or AT-M6 for short.