In 2006, the Anaheim Mighty Ducks lost their might.
Don't worry. It wasn't an accident. Sold by the Walt Disney Company in 2005, one of the first changes new owner Henry Samueli made was a full rebrand, putting some distance between the club and the near-flawless 1992 film that spawned them, updating the colour scheme and losing the all-important modifier. At the beginning of the 2006-07 season, the Mighty Ducks ended and the Ducks began.

But if the reports are true, in 2013-14, the Ducks' 20th season, the Mighty Ducks will be return, at least for one night.
According to a Ducks' press release, the 20th anniversary season will be commemorated by some nods to history, one of which will be a “Throwback Night” near the start of the 2013-14 regular "season, paying homage to the inaugural 1993-94 Mighty Ducks of Anaheim season." And according to Ducks season ticket-holder Andrew Heidecker, that night will see the return of the Mighty Ducks.
From Icethetics:

I am a season ticket holder for the Anaheim Ducks. During their select-a-seat promotion, they had all the high-ups of the Ducks organization there. I spoke with one of them and he informed me that the Ducks will become Mighty once more during a game in October.
They will revive the 1993 [inaugural] jersey (he was not sure if it would be eggplant or white since home was light colors back then) but he did say that it will be set to the new Reebok Edge jersey and will be available for sale all season long in the Ducks team store.
Currently, the jersey is set to be worn for only one game early in October, but that can be altered to more than one game. Not to sound antsy, but the way he said it, it sounded like there may be more than one "MIGHTY" jersey being produced for wear this season.
More than one game, you say?

It's worth noting that the Ducks and the Kings will be playing an outdoor game at Dodger Stadium on Saturday, January 25. Could the Ducks be Mighty that day as well?

From a marketing perspective. It would make sense, giving the Ducks an opportunity to sport and push both the original white Mighty Ducks jersey and the eggplant one in the same year. You make a better profit that way.