What's in the Chamber of Secrets that will come up later?

[sawsan_issa]

No: HPFGUIDX 90369

I had read that JKR says that there is something in the Chamber of
Secrets that will play an important part in the books to come. That
has me on my path again of wondering what is in there? Is it that
there is something about the Chamber itself or in the book? I reread
the part about the Chamber, and the only things that seemed to stand
out were the 2 intwined snakes at the entrance that had emerald eyes
and seemed to be alive. Also, the huge statue of Slytherin and the
basilisk coming out of his mouth. Any ideas?

Sawsan