Fed in an interview to Guardian (just before Rotterdam start).
“I guess by being here now, and maybe being in Dubai, it’s just going to have to be lighter if I play the clay-court season. Or not at all. So I just have to get into this situation a little bit, because the priority is for me to try to defend my sunshine double in Indian Wells and Miami. So, then we’ll see what happens with the clay, what happens next.”
So, Fed is clearly planning on playing both IW and M. Most probably he will skip Dubai, especially if he manages to reach #1 in the next couple of days.