Education Minister Liz Truss has promised that the Government will deliver proposed childcare plans "as fast as we can".
Speaking to Daybreak she said the Government will need until 2015 to get the new systems will be in place.
She added: "We spend £5 billion on childcare, at the moment not enough money is going through the frontline."
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The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.
In the unexpected announcement on Monday, Mr Key said it was the "right time" to leave politics.
As the Government's Brexit appeal comes to the Supreme Court, here's a look at what you need to know.