Last month the Zolberg Institute on Migration and Mobility at The New School convened a meeting of experts on refugee law and policy to deliberate on, and to make concrete recommendations for, the Global Compact on Refugees (GCR). You can find the Conclusions and an Explanatory Note here.
The idea of "international migration law" is not new, but it is receiving increased attention from a number of legal scholars. In some degree, they are responding to the domination of refugee law in discussions of international law relating to the movement of people. AJIL Unbound (the online edition of the American Journal of International Law) has recently published a "Symposium on Framing Global Migration Law," in which Jaya Ramji-Nogales has a piece well-worth reading: "Moving Beyond the Refugee Law Paradigm."