I seem to remember he stated at the beginning of the season he wanted to stay, but by all accounts had a bad relationship with Roy Keane, and when things were blowing up about Keane it was around then doubts came up about Delph.
I do not (still even though he has re-signed) think he is as good as people make out, he needs an end product but he can hopefully develop into something special.
This is a good sign for the club though, trying to keep one of our best players, and from the quote above Im sure they have shared some of the plans for the future with him.