(Caution: This entry includes the core of the story.)
I watched "X-Men: Days of Future Past - Rogue Cut" on the DVD, recently. It is a so-called director's cut of the original film.
Amazon.com: X-Men: Days of Future Past - Rogue Cut [Blu-ray] 
In the X-Men: Days of Future Past, Kitty, a mutant girl whose ability is sending the soul of Wolverine to the past, got wounded in the middle of the story. She endured the pain not to lose the control of her power.
My past entry: X-MEN days of future past: too much explanation and cancelation
In contrast, in the Rogue Cut, her damage was described as too serious to maintain the use of her power. Therefore, X-Men decided to rescue Rogue, who has a power to absorb other mutant's power, to substitute her.
Rogue was captured and frozen so that she could not escape or use her power. Iceman and Magneto entered the prison secretly to get her back. This scene is mirroring of the situation in the past young Magneto entered the Pentagon to get back his special helmet. Young and old Magnetos are both heroic.
Iceman was sacrificed due to the attack of Sentinels on the way to escape. But they had no time to be discouraged. Rogue touched Kitty to absorb her power in order to succeed her role. This scene is quite symbolic, because Rogue was an ex-lover of Iceman, and Kitty was the new lover. Rogue had to save her rival when the lover had passed away.
Honestly, if Rogue rejects to cooperate with Kitty, everyone will be killed by Sentinels. Instead, if this operation is successfully completed, everyone including Iceman will revive. Anyway, she has no choice, simply.
I think this edition is superior to the original one. I do not know the reason Rogue was deleted from the original film. Perhaps, the total length should have been shortened. I admit the inserted scenes are a little redundant. It is lucky to compare the both version on the DVD.
Personal Rating: 4 (good)