Launching his report in Manchester, Sir David Higgins, HS2's recently appointed chairman, will say that he would like work to start on the second phase at the same time as the first phase.
The second phase, taking the line in a Y-shape to north west and north east England is set for completion around 2032/33. He is also expected to recommend a completely new station at Euston - the site for the line's London terminus.
Sir David, the former London Olympics supremo who has joined HS2 Ltd after being Network Rail chief executive, is also expected to recommend scrapping plans to link HS2 with HS1, the London to Kent coast Channel Tunnel high-speed line.
HS2 link requires too many compromises in terms of impacts on freight, passengers and the community in Camden, says Transport Secretary.
Despite pledging to find savings in the expensive High Speed 2 train line, the project's boss has failed to find significant financial cuts.