There won't be any camping inside the circuit, just Blue Nord, Houx Annex and Epinettes I believe. Once they are gone that's it.
However, those of us that had a credit note against last years race, which included in circuit camping (we had Mulsanne) will have been offered one Blue Nord. If not everyone takes up the offer then those will go back on general sale. I have been offered Blue Nord but won't be taking it, so that's at least one that will become available!