2015 Best Novel: Lock In by John Scalzi would have been on the final ballot instead of The Dark Between The Stars by Kevin Anderson, assuming both finalists who withdrew IRL still withdrew.
2015 Best Novella: Two of the John C. Wright finalists, "The Plural of Helen of Troy" and "Pale Realms of Shade", would have been replaced by Patrick Rothfuss' "The Slow Regard of Silent Things" and Ken Liu's "The Regular". This was a category where No Award won IRL.
2015 Best Novelette: No change to the final ballot, because John C. Wright's story which was disqualified IRL would not have qualified under EPH.
2015 Best Short Story: assuming the same withdrawals, John C. Wright's "The Parliament of Beasts and Birds" and Steve Diamond's "A Single Samurai" would have been replaced by Ursula Vernon's [Nebula-winning] "Jackalope Wives" and Aliette de Bodard's "The Breath of War". This was a category where No Award won IRL.
2015 Best Related Work: Wisdom From My Internet by Michael Z. Williamson and Letters to Gardner by Lou Antonelli would have been replaced by Jo Walton's What Makes This Book So Great and the Mad Norwegian compilation Chicks Dig Gaming. This was a category where No Award won IRL.
2015 Best Graphic Story: Sex Criminals volume 1 would have been replaced by Schlock Mercenary: Broken Wind.
2015 Best Editor, Short Form: Bryan Thomas Schmidt and Vox Day would have been replaced by John Joseph Adams and Neil Clarke. This was a category where No Award won IRL.
2015 Best Editor, Long Form: Vox Day would have been replaced by Liz Gorinsky. This was a category where No Award won IRL.
2015 Best Professional Artist: Kirk DouPonce would have been replaced by John Picacio.
2015 Best Semiprozine: Andromeda Spaceways Inflight Magazine would have been replaced by The Book Smugglers.
2015 Best Fanzine: No change.
2015 Best Fancast: No change.
2015 Best Fan Writer: Matthew David Surridge, who withdrew IRL, and also Dave Freer would not have qualified; they would have been replaced by Abigail Nussbaum.
2015 Best Fan Artist: No change
2015 Campbell Award: No change.
2014 Hugos: Most categories would have been unchanged by EPH. The exceptions are:
2014 Best Editor, Short Form: Sheila Williams would have been replaced by Matthew David Surridge
2014 Best Professional Artist: Galen Dara and Fiona Staples (the latter tied for fifth place in nominations IRL) would have been replaced by Joey Hi-Fi.
2014 Best Fancast: the three-way tie at fifth place for nominations IRL would have been resolved in favour of Tea and Jeopardy, with The SF Signal Podcast - which actually won - and The Writer And The Critic losing out.
1939 Retro Hugos: there would have been relatively more changes, due I think to the relatively lower number of nominators.
1939 Best Novella: "A Matter of Form" by H.L. Gold would have been replaced by "Tarzan and the Elephant Men" by Edgar Rice Burroughs.
1939 Best Short Story: "Hollerbochen's Dilemma" by Ray Bradbury would have been replaced by "An Experiment of the Dead" by Helen Simpson.
1939 Best Fan Writer: Harry Warner Jr would have been replaced by William F. Temple.
There is a lot to think about here. It's clear that EPH in 2015 would have given a more diverse ballot, and would have provided two non-slate candidates in four of the five categories where voters No Awarded the slates. But applied to a "normal year", we actually lose a finalist who won; and for the lower-intensity Retro Hugos, the edge effects get a bit unpredictable.
Dave McCarty, Hugo Admnistrator both this year and in 2014, comments in the paper: "The changes to the Ballot and Long list are not easily verified and for people reviewing the detailed results at the end the only way to check that the process is working correctly would require access to secret nomination data and significant time. The difficulty in verification means that to check any result requires time which is NOT available to award administrators when it is time to close the nominating and prepare for the Ballot announcement. These are significant hurdles for a process that is generally designed to be open and democratic."
I sympathise, and I also have a more basic concern, which is that EPH (which seemed to me like a good idea when it was first proposed) is fundamentally designed to address last year's problem. On Sunday we will find out what difference it would have made this year. But as Hugo administrator for Worldcon 75, my personal concern is next year, and I guess if I were at the Business Meeting, I would need to be convinced that it is the right answer at this time. Of course, if the Business Meeting does ratify it this weekend, I'll duly implement it regardless of my own views.
Edited to add: I've been reflecting on this a bit more, after being reminded over on File 770 that the only change EPH would have made in 1984 would have been to drop a woman (Sherri S Tepper) from the Campbell ballot.
The changes it would have made in 2014 would have been to drop a woman in favour of a man for Best Editor Short Form, to drop a woman and a man and bring in a different man for Best Professional Artist, and to drop both the actual winner and another podcast run by a woman and a man from Best Fancast.
Admittedly it's a small sample, but I don't really like what I am seeing of EPH's effects on the diversity of the ballot in "normal" years. However I have to concede that it would have replaced that embarrassingly bad Ray Bradbury story with one by Helen Simpson on the Retro Hugo ballot.