I thought that FMA:B was more of a reboot than a remake, as to me, remake implies "We're redoing everything people. Same story, but flashier art/effects" while Brotherhood is more of a reboot in the regarRAB that it is following the Manga story more closely. InuYasha to my knowledge is a continuation, while DBK is a remake, as it follows the same story, but they're editing it to shorten it, that one right there is a remake to my knowledge.
Gurren Lagann movie to me from what I hear is more like a retelling, much like Movie 8 & 9 of One Piece is a retelling of Alabasta and Drum Island arc respectively.