WWE's Twitter feed provides the details for the match that was made official on Monday night:
There are several different ways this could go, but two potential scenarios stick out.
On the one hand, one wrestler could walk out a clear-cut winner, and the WWE and World Heavyweight titles could then be unified into one belt.
However, while the unification of titles is seriously intriguing, and something lots of fans would like to see, it's the type of memorable moment you would assume is reserved for a pay-per-view such as WrestleMania or Royal Rumble—certainly not TLC.
That, of course, leaves the other—and probably more realistic—option: Cena and Orton somehow leave TLC with the title they didn't enter with. While a simple switch is a finish that would likely anger fans, it's probably not unrealistic the way things have been going lately.
Either way, though, following what many saw as a truly disappointing PPV, the company at least has a fresh, potentially unique storyline with a compelling stipulation that it can use to help build anticipation going forward.
If the titles are indeed unified, hopefully that means the company is ready to put more stock and attention into the secondary titles, such as the Intercontinental and United States championships.