Kevin A. Wortman writes:
The small language [sh]ould include a minimal interface to sockets, concurrency, and hierarchical file systems.
These will be provided as packages in the large language. You might want to look at NetworkPortsCowan, DatagramChannelsCowan, ThreadsCowan, FilesAdvancedCowan, and DirectoryPortsCowan for some of my ideas for them. Note that the large language will not be monolithic, but will consist of packages that may be independently supported.