I’m very grateful to IanVisits for this document
because it seems we have OFFICIALLY the opening patterns for the Line:
First half of 2022: high-low shuffles
When the Elizabeth line opens it will operate as three separate railways. Customers from the west will initially need to change at Paddington for services into the central section of the route, and customers from the east will need to change at Liverpool Street. The service in the central section between Paddington and Abbey Wood will be 12 trains per hour, all day.
Later in 2022: low-level waits
A revised plan for an earlier full opening of the Elizabeth line has been developed. The latest plans ensure that Elizabeth line services from Reading, Heathrow and Shenfield can connect with the central tunnels without the need to change at Paddington and Liverpool Street respectively as soon as possible after the opening of the central section of the railway. The earliest expected date for this is autumn 2022. When this phase launches, services from Reading and Heathrow will operate through to Abbey Wood. Services from Shenfield will operate through to Paddington. The service in the central section between Paddington and Whitechapel will be 24 trains per hour during the peak.
2023: direct services
The final milestone will be no later than May 2023, when a fully integrated timetable will be in place, allowing seamless travel across the entire line.