Among the measures expected will be moves to end final salary schemes and replace them with so-called "career averages".
Most employees will also have to work until the state pension age, which is also due to rise, although exceptions will be made for the Armed Forces, police officers and firefighters.
The Coalition says the rapidly ageing population means the current pension arrangements are unsustainable.
But some unions have already pledged to fight the proposals, just days after talk at their annual conference of the potential for a general strike.
Last November around 1.5 million workers across the UK, including 300,000 in Scotland, staged a walkout in protest at similar pension proposals.
Prime Minister David Cameron signalled the Coalition's willingness to take on the unions, attacking them yesterday as a "threat to the economy".
It has also emerged the Army could be used as "strike breakers" following threats of industrial action this autumn. Army personnel, who won praise for helping to deliver this summer's Olympics, could be used to fill in for striking workers.
But Brendan Barber, the outgoing general secretary of the TUC, has already condemned the plans as "inflammatory".
The new Public Service Pensions Bill is also expected to include measures to safeguard the current pension arrangements for those less than 10 years away from retirement. Other elements will be ringfenced for 25 years – meaning the changes will be a "settlement for a generation".
In addition, there will be an "employer cost cap" to ensure that public service pensions remain affordable in the future.
The bill will close the generous Great Offices of State pensions, which allow the Prime Minister and other ministers to receive half their salary even if they spend just a day in office.
The plans are expected to save the taxpayer hundreds of billions of pounds over the next 50 years and effectively halve the costs of public sector pensions to the Treasury.
Mark Serwotka, the general secretary of the Public and Commercial Services union, which represents civil servants, said: "We intend to fight this bill politically but we also believe that co-ordinated industrial action is still necessary on pensions as well as pay."
He called for strikes to happen as soon as possible after cuts protests planned for October 20.
Danny Alexander, the LibDem Chief Secretary to the Treasury, said the measures were a "good deal for taxpayers and a good deal for public service workers: a settlement for a generation".
The Treasury says the plans will help save £65 billion over the next five decades, with other pension reforms saving £430bn over the same period.
Unions have also threatened strike action over the continuing public sector pay freeze.
Scottish Finance Secretary John Swinney is expected to announce he will offer a small pay rise for workers in his Budget next week, but unions have warned he will need to go further than the expected modest increase to prevent strikes in Scotland, as well as across the rest of the UK.
Contextual targeting label: