The first week in July is a holiday event: 1 July (Monday) is Canada Day and 4 July (Thursday) is well, err fourth of July, which means fireworks and music!
Considering that Dr. Piotr Witkowski announced the islets being installed 5 April, 90 days happens to be 4 July.
The 90 day question is how close to 4 July will the Sentinel Pouch be removed? Arguments can be made for 1, 2, 3 July. One would expect 5 July (Friday) as unlikely since it is between the holiday on Thursday and the weekend. The 8 July (Monday) is also a real possibility since the whole week is available for follow-up.
The above suggest that 9 July (or close thereof) is a date that makes sense for news to be released. Please keep in mind that technical details may take several days to discern so the news MIGHT be qualitative initially with details forthcoming "later". However, IF 1, 2, or 3 July is D-Day, then the news may have more technical details.