The Preveiws listings in Post #2 have been updated with IDW's new dates in the post above this one... and added some extra issues as well. This is the updated release listing, which I have added to the June, July and August Comics topics.
I will do up a September comics topic for the ones now in that month, as it is really unlikely that Previews/Diamond will put out a solicitations book for that month to promote more comics on top of the delayed comics that collectors and comic stores are struggling to keep up with.
The October topic will be left until later, to see if there is a solicitations by Diamond/Previews released for that month (around July/August).

-------------------

JUNE 9
Transformers: The IDW Collection – Phase 2 Vol. 11 Hardcover - OUT (release date from Amazon America, so must have been released a week earlier than planned)

JUNE 17
Transformers #20 (should have been released this week)

JUNE 24
Transformers vs. The Terminator #2 (of 4)

-------------------

JULY 8
Transformers: Galaxies #7

JULY 15
Transformers ’84: Secrets and Lies #1 (of 4)

JULY 22
My Little Pony / Transformers #1 (of 4)
Transformers #21

-------------------

AUGUST 12
My Little Pony / Transformers #2 (of 4)
Transformers #22
Transformers: Galaxies #8

AUGUST 19
Transformers ’84: Secrets and Lies #2 (of 4)
Transformers vs. The Terminator #3 (of 4)

AUGUST 26
Transformers #23
Transformers: Galaxies #9
Transformers Vol. 2: Change in Their Nature Hardcover

-------------------

SEPTEMBER 2
Transformers ’84: Secrets and Lies #3 (of 4)

SEPTEMBER 9
Transformers: Galaxies #10
Transformers: Galaxies #11 (to be confirmed later)
My Little Pony / Transformers #3 (of 4)

SEPTEMBER 16
Transformers vs. The Terminator #4 (of 4)

-------------------

OCTOBER 7
My Little Pony / Transformers #4 (of 4)

-------------------

NOVEMBER 4
TRANSFORMERS 84 LEGENDS & RUMORS 100-PAGE 1-shot (pushed back from June 24th)

-------------------

NO NEW DATE YET
Transformers ’84: Secrets and Lies #4 (of 4) (probably late September or early October)