The safe bet is that the new taco will be the Doritos Flamas-flavored taco tested earlier. However, a Taco Bell rep stated that "this #__DLT, contrary to speculation, may not what be what you’re expecting" and to "expect the unexpected." But, it's possible they may just be calling it by a different name.
They also tested a Fiery Chicken Cool Ranch Doritos Locos Taco previously this year as well, so that's also a possibility. That's not really a new flavor though and more of a variation on a current one.
Fortunately, I should have the opportunity to try out the new Doritos Loco Tacos sometime next week, so I'll let you guys know what I find.
The Doritos Locos Taco platform has been hugely successful for Taco Bell, with sales of the first two varieties already approaching 570 million tacos, so you can expect more new flavors in the future.
