The heaven would be rolled up like a scroll and it would be given to those who have strive hard in the world to earn paradise in the hereafter. It is a promise and Allah does not break His promise.
“And (remember) the Day when We shall roll up the heaven like a scroll rolled up for books. As We began the first creation, We shall repeat it. It is a promise binding upon Us. Truly, We shall do it.” Quran (Surah Al-Anbiya, 104)