Well looks like Enterprise is taking a turn for the worse again. I really don't think there needs to be an explaination for the change in the way the Klingons look from TOS to the movies. Nevermind the fact that they have the Klingons showing up in Enterprise looking like the movie Klingons so now they are just screwing it up more so by doing the movie.
From TrekWeb.com:
There is no end in sight for the wave of TOS-inspired storylines on STAR TREK: ENTERPRISE this season. On the heels of a three-part Romulan arc helping explain why the Romulans were never seen before the time of TOS, TrekWeb has received information about a new episode titled "Affliction," which will tackle perhaps an even more famous bit of TREK lore.
The episode kicks off in an underground Klingon laboratory where a Klingon scientist and General oversee a strange project. Soldiers bring in a captive Klingon warrior and subject him to injection of a green fluid. After a few moments, it seems that the prisoner's forehead ridges bear the brunt of the fluid's effects. We are very likely looking at a canonical explanation for the famous change in makeup between the Klingons of TOS and the Klingons of STAR TREK: THE MOTION PICTURE?
Meanwhile, Phlox has been offered a prestigious position with the Interspecies Medical Exchange but is kidnapped by a band of hooded aliens. The kidnappers turn out to be Rigelians, our first look at this oft-mentioned STAR TREK race. The Rigel system and its inhabitants have been mentioned in many TREK episodes such as "Mudd's Women," "Wolf in the Fold" and DS9's "The Passenger" among others. ENT's series premiere "Broken Bow" visited Rigel X, but encountered no Rigelians on screen.
As "Affliction" progresses, Klingons attack and board Enterprise for some clandestine purpose. Engaging the MACOs in a firefight, the Klingons implant a computer program into the ship before escaping. One Klingon, however, is shot by the MACOs and captured. His name is 'Marab' and he is thrown in the brig. Marab reveals that he is infected with a plague that is sweeping the Klingon Empire, and we learn that at least one symptom of the fatal disease is increased physical strength.
Also in this episode, 'Erika Hernandez' and the Columbia NX-02 will make an appearance. Hernandez and the Columbia were last seen in "Home."
This information is preliminary and subject to change. You should also treat it lightly until confirmed through official channels.
From TrekWeb.com:
There is no end in sight for the wave of TOS-inspired storylines on STAR TREK: ENTERPRISE this season. On the heels of a three-part Romulan arc helping explain why the Romulans were never seen before the time of TOS, TrekWeb has received information about a new episode titled "Affliction," which will tackle perhaps an even more famous bit of TREK lore.
The episode kicks off in an underground Klingon laboratory where a Klingon scientist and General oversee a strange project. Soldiers bring in a captive Klingon warrior and subject him to injection of a green fluid. After a few moments, it seems that the prisoner's forehead ridges bear the brunt of the fluid's effects. We are very likely looking at a canonical explanation for the famous change in makeup between the Klingons of TOS and the Klingons of STAR TREK: THE MOTION PICTURE?
Meanwhile, Phlox has been offered a prestigious position with the Interspecies Medical Exchange but is kidnapped by a band of hooded aliens. The kidnappers turn out to be Rigelians, our first look at this oft-mentioned STAR TREK race. The Rigel system and its inhabitants have been mentioned in many TREK episodes such as "Mudd's Women," "Wolf in the Fold" and DS9's "The Passenger" among others. ENT's series premiere "Broken Bow" visited Rigel X, but encountered no Rigelians on screen.
As "Affliction" progresses, Klingons attack and board Enterprise for some clandestine purpose. Engaging the MACOs in a firefight, the Klingons implant a computer program into the ship before escaping. One Klingon, however, is shot by the MACOs and captured. His name is 'Marab' and he is thrown in the brig. Marab reveals that he is infected with a plague that is sweeping the Klingon Empire, and we learn that at least one symptom of the fatal disease is increased physical strength.
Also in this episode, 'Erika Hernandez' and the Columbia NX-02 will make an appearance. Hernandez and the Columbia were last seen in "Home."
This information is preliminary and subject to change. You should also treat it lightly until confirmed through official channels.