As it is there is no known information on these skills. Even if the staff team held information about these skills, they would not be allowed to talk about it.
Summoning would not fit into the game, it would downright make everything easier than it already is, and that would not be a very good thing. Construction does fit and could be a great money/item sink, it would make the prayer skill considerably easier which may be a negative thing. The thing is, a new skill takes a considerable amount of time to develop, don't expect them too often. It took a huge amount of time for farming to be added. Hunter was also added not too long ago. I don't think it's all that high of a priority.