If Volume 3 is released I hope that End Credits Suite for volume 2 will be also included.
Don't think it would be. Leigh already picked out *three* Morton Stevens scores (including Pigeons from Hell) to be included on Volume 3 along with the four remaining Goldsmith scores. That means Vol. 3 will be more packed than any previous volume, and I very much doubt there'd be room for a Vol. 2 leftover. In our impromptu "Interview" half of the conversation David just shared above (released three months ago, not long after it was recorded) he named the three Stevens scores he had selected cues for, and also said this volume wouldn't have room to include cues he regretted leaving off of Vols. 1 & 2 (just listen to the first 10-12 minutes or so, before we get into his work on Damnation Alley): https://goldsmithodyssey.buzzsprout.com/159614/8425660-odyssey-interviews-leigh-phillips
The End Credits suites (either Vol. 1's on the CD album or Vol. 2's which was later released digitally online) didn't have any unique music anyway; it was all simply edited together from earlier cues.