I got this from another forum, from (in my eyes) a reliable source:
For your pleasure I have details on the X-Men 3 alternate endings.
I get access to DVD's early because of work so I have watched them.
Although I don't know why they've called the 'Alternate' endings, as they're really only extended ending sequences, or additional parts to the original ending.
These are obviously SPOILERS, so don't read them if you don't want to know.
SPOILERS AHEAD...
LAST CHANCE...
1.New School Year Begins.
This is an elogated scene which shows Storm welcoming the students back to school in her new role as headmistress. The scene features Storm, Iceman and Beast discussing the transition and new influx of students.
Iceman says he thinks they're going to need more uniforms. Leech runs up to Storm to hug her, as does Siryn.
2. Wolverine Goes Back To Alberta, Canada
In a nice touch to Singer's first installment, Logan returns to the bar where they held the cage fights in the first film and talks to the owner, who had his shotgun dismantled by an angry Logan.
The barkeep asks if he's heading home, to which Logan replies (in an obvious nod to the solo Wolverine movie) 'Something like that'
3.Rogue Returns
The best of the three involves Bobby walking into Rogue's bedroom to find her sitting on her bed. She tells him she couldn't go through with it and has kept her powers, because that's who she is.
Bobby then hold's her gloved-hand and hugs her.
A much better Rogue ending than the cop out of the film where she cowardly had her powers taken away.
There you go then people!