Rotorua MP Todd McClay's private member's Bill was selected in a parliamentary ballot last week.
The first-term National MP has worked with Waitaki MP Jacqui Dean on the Easter trading issue and the pair announced during a visit to Lake Hawea in September they intended to try again to get the law changed.
The pair's local electorates both include resort towns which are prohibited from opening on Good Friday and Easter Sunday (Wanaka, Rotorua), while neighbouring tourist destinations Queenstown and Taupo are exempt from the law.
Mr Stock said it was the first time an MP from a sitting government was able to present a Bill on the matter of Easter trading.
Mrs Dean said the present law created "inequalities" and Mr McClay's private member's Bill sought to rectify that by providing a "level playing field".
However, the pair face a battle from trade unionists who say the new Bill will be met with strong opposition from shop workers, community groups and churches.
National Distribution Union general secretary Robert Reid said Easter should remain a holiday that everyone could enjoy.
The trade union, which represents retail shop workers, supports the existing trading law.
The law remains in place after parliamentary Bills to amend it have been voted down.
A private member's Bill from Mrs Dean to amend shop trading laws was defeated 87-34 in May 2007, and former Rotorua MP Steve Chadwick's Bill on Easter trading was also voted down two weeks later.
Mr McClay said he thought there was a "very, very good opportunity" for the law to be finally changed - on the 10th attempt since 1990.
"There is a challenge in front of us. Parliament seems to have had more difficulty with attempts to change this law, than any other," he said.
He had been lobbying hard, alongside Mrs Dean, to garner support for the new Bill, which will focus specifically on Easter Sunday trading.
Allowing retailers to open on Easter Sunday was about providing "choice for local communities and visitors", Mr McClay said.
The Bill was drafted so no retailer would be compelled to open, nor would any shop-worker be forced to work on Easter Sunday, he said.
If passed, it would give district councils the power to allow shops within their boundaries to open on Easter Sunday.
The Bill could have its first hearing within the next two weeks, otherwise it would be heard when Parliament returns to sit after the New Year, Mr McClay said.
