Hey,
I think this question is almost impossible to answer without input from the admissions committee.
But as an engineer I feel compelled to come up with an answer
So here is my guess:
Based on last years announcements, about 70% of interview slots are gone => 30% more to come.
Based on last years GMAT club statistics, 32 people updated their status on October 6th (29), 7th (3). This year, October 5th is not gone yet. But till now 22 people have updated their status. Lets err on the side of being safe and assume that about 3 more people will update their status.
Going by this, we can assume that about 470 students were invited for an interview. Lets again err on the side of being safe and say that they announced 500 invitations.
All of this implies that 60% of interview slots are gone => 40% more to come.
I think it would be safe to assume that 30% - 40% interviews are yet to be announced. Good luck
Adi