Im guessing that since EVGA is out of stock everywhere they are making a new hadron...
 
Id like to see a rear fan, 750 watt PSU, the HDD and CD bracket removed in favor of a single or dual 2.5" slots mounted to the back tray, standard ITX tray mount with access to the back of the board for cooler mounting.

Yes, Hardon is very interesting small case no matter if people use him for office or hard core gaming RIG.
Both Hadron and DG-87 and unique cases and unseen design on market.
Maybe now EVGA prepare something else or plan some mATX case or Hadron revision. 
I think even 600-650W would be completely enough. Only if case allow dual GPU than need bigger.
But people installed all 250W models for last 2 years in Hadron Air and Hydro.
Your idea for HDD and CD bracket is nice. I think such small case need max one place for HDD and today it's much better external USB Blu-Ray DVD-RW.
There are many excellent models on market and time of internal CD pass. And off course more people will invest in 1TB SSD and 512GB M.2 drives in future.
 
It's bad because 2TB SSD SATA III will not drop below 400$ long time.
But I think it's time easy to enthusiast make some change in their PC, to remove everything what they use rear on external HDDs, USB 3.0 is best price
and to keep in PC only what they use most. 

The main reason i want to see a larger psu is i like to have my components in the efficiency curve of the psu. Total watt output all the time isnt a good idea. I have a itx build with a 5960x, titan xp, 32gb ram, 1tb m.2, and 2x 2tb ssds. All in a cm elite 120. Its a small powerful on the go editing and workstation. I want to cram it all into a hadron air. But... Cant get one. Imho i havent used a cdrom in my computers for almost 6 years now and that was to load windows... Everything is streamed or thumb drive now cds are dead...