This is not a general election. The leave camp will not be given the opportunity to make it happen, and they have no business putting forward a manifesto since that gives the false illusion they're somehow in control of the country's destiny post-brexit. Of all the many lies that Leave is promoting , that's probably the biggest (yes, even bigger than the £350 million fantasy)
Even if the vote skewed 99% in favour of Leave, it still won't be the Leave camp making policy!
Remain haven't made any particular commitments because their camp is a vote for "no change"**. There's nothing to promise because, again, this isn't a general election. The Tory party already has an established manifesto, and will continue to enact it in the event of Remain.
That's why Remain are so furious about the way Leave are going about distorting the picture: as Tories, Boris Johnson, Michael Gove, Priti Patel etc are as responsible for implementing the existing, already agreed Tory manifesto as Cameron or Osborne are!
**NOTE: "no change" doesn't mean an approach to the EU frozen in amber for all time. Cameron already got some commitments to reform, some of which will be ratified by a Remain result, and others will be implemented in the following weeks and months. You can expect Cameron to continue to push to improve and reform the EU in ways that benefit the UK post-referendum, just like successive governments have over the years.