MP-QUIC
Multipath QUIC — IETF draft (RFC progress 2024). Multiple network paths for one QUIC connection (WiFi + cellular simultaneous), failover automatic on network switch. Successor to MPTCP, designed for the modern mobile experience.
Use case: phone has both WiFi + cellular interfaces → MP-QUIC aggregates bandwidth, switches seamlessly on signal loss. Apple iCloud Private Relay uses it. Improvement over MPTCP: built into encrypted-QUIC-stream (less middlebox interference), better mobile handling. Adoption trajectory: Apple + Cloudflare leading, Google Chrome experimental. Standard expected ~2025-2026. Modern mobile app: latency improvement from fast failover is significant (50ms vs 5sec TCP timeout).