It's difficult to say; this example's meaning is very dependent on the context.
What we're really looking at are likely developments in the structure of the company over the next five to ten years. = In this version you are reviewing likely developments.
"We are looking at likely developments."
What we're really aiming at are likely developments in the structure of the company over the next five to ten years. = In this version you have already reviewed the possible developments, and now you are working toward them; or it could mean that you have not yet determined all of the likely developments, and you are now explaining what you have thought of so far.
"We are aiming at likely developments."
As you can see, "aiming at" is very ambiguous without knowing the context of this example.
I'm still learning myself, but I was compelled to give you my thoughts. Hopefully, someone will correct me if something is wrong.