One of my NG H3 boards has ethernet, and following the examples posted here I've been able to wget a URL successfully (so DHCP is working as well).
I'm not curious whether there are any plans for a BASIC API to send/receive data. The use case I have in mind is writing networked games.
Thinking some more .. I’m thinking something the Micro:Bit radio API that makes it easy to send and receive data to other microbits. For LAN it would certainly be cool to be able to just discover things nearby to play against.