The GMAT Club Speculation Machine, of course.[/quote]
haha yup, pure speculation.
A few things: people have noted last wave has historically been India invites. So far we have seen few invites (especially for US apps). This probably makes sense given how quick of a turnaround the first two waves were after application deadline. My guess is they needed more time to review highest represented geographies and if wave 4 = India that means a lot of US invites should go out today.
But yes, no insider knowledge -> pure speculation.