Q,
I think I've figured out the full meaning of D5. May 4th was a meaning (D=4, 5th month), which was Nakasone replying to then acting-DNI Grenell with the list of Hussein personnel who unmasked General Flynn during a very narrow timeslice.
Yesterday, on June 6th 2020, the 76th anniversary of D-day, you reposted a prior Q+ post which specifically called out D-day. A post from a few days before (can't remember off the top of my head, may have been POTUS tweet) had a conspicuous missing D.
In D day nomenclature, D-5 refers to D-day + 5 which brings us to June 11th. I'm guessing there will be a very big release this day, co-incidentally (in the Jungian sense) the day before oral arguments are made in the DC appellate court for General Flynn on the petition for writ of mandamus. Last week, Senator Ron Johnson issued through his committee several subpoenas. One of the listed items was all unmasking requests of all individuals in and associated with the Trump campaign: July 2015 (iirc July, definitely 2015) through Jan 2017.
I'm guessing specifically that on 11 June, DNI Ratcliffe will hand over these documents (which former acting DNI Grenell declassified), and Senator Johnson will release them. I'm also guessing the contents will be extremely damming as to the sheer volume of unmasking requests. Cherry on top would be fulfillment of DoS subpoena item, which will likely show extensive foreign involvement (though that may happen another week. Digesting takes time).
If I'm right, I don't expect conf now, that would spoil the surprise (and be generally unwise to reveal prematurely). All I ask is some tacit acknowledgment after the fact that I figured it out, and these cabal morons didn't.
Thanks again for all you do