I dont think the last 8K sec filing is vague at all. I think its crystal clear as I see it.
The SEC requires clearly when a company should and only can use regular press releases and when a company can not. The sec also is very clear when an 8K sec filing should be issued and when not.
For example before and on June 5 when Dr Bosch presented new data on the trial that was blinded (we obviously didn't know what patient what was when etc so blinded) NWBO was not required nor permitted to release an 8K to announce they were anticipating a presentation of blinded data by Bosch and didn't release an 8K afterward. We did, however, see the press releases before and after.
Now we have seen an 8K sec filing on the 22nd. Apparently now NWBO is anticipating something material which before June 5 was not the case. So in the last 8K they cannot, legally mathematically not talk about just blinded data of which they anticipate the disclosure of. AKA yet another "Dr Bosch presentation". It can only, therefore, mean that they are waiting for the disclosure (which according to Oxford dictionary means Allow (something hidden) to be seen!) or in other words unblinding the blinded data. Because they have also stated its about interim data, it must be the anticipating of the unblinding of PFS data...