I've planned it out, in a very similar way to the way I did the last book. I think though that this time, I probably haven't gone into as much detail. I know that last time, having such detailed planning made the writing process easier, but the more I wrote the further away from the plan I seemed to get.
The biggest change was probably the character of Mikel. Originally in the planning he was supposed to die, but when I got to the point, I liked him too much to kill! So he stayed, and I had to change the narrative to allow him room to be part of the story. In the end, I was glad that I did because I think that it actually helped to keep the plot together and made it a better book.
It will be interesting to see how this next novel evolves. Cross fingers it all works well!!