The OMG has published this month the official specifications of the expected new version 1.3 of SysML, two years after releasing SysML 1.2.
SysML 1.3 includes a new definition of ports via the Full Ports and Proxy Ports, both allowing to combine operations to call, and items to flow in and out the block. SysML 1.3 updates also include nested ports, nested flows, association blocks, and port compatibility.
Further details are available from my post entitled "SysML 1.3 beta preview".