I'm not sure why I'm bothering to open this can of disagreement, but I'm very glad to hear that not only is there an X4, but that it follows the events of X3.
Like every X-Men fan out there, it was hard for me to accept the deaths of some of the X-Men, but X4 and 5, could possibly be the vindication of those deaths. I've always been of the opinion that a movie or T.V show can alter its source material as long as it doesn't damage the over-arching story (though it's still a little tough for me to watch True Blood despite the fact that it meets those requirements) so I'm interested to see what the X-Men universe looks like without Cyclops. Jean and Xavier might come back (Xavier for sure) and there could be some interesting storylines yet to get from this particular iteration of the XMen universe.