Upstreaming multipath TCP

QUIC is a very cool protocol and effectively support multi-path out of the box since IP and port aren't used to identify connections. In fact roaming works a lot better than MPTCP since you don't need to report your new IP+Port before breaking the old connection, which means you can migrate between two WiFi access points or similar where there is never an overlap where you are connected to both networks.

However TCP is far from dead, and this is still very useful until then (if it ever happens).