Orion's ICPS & EUS have disappeared from the tech tree and part lists.

[KamikazeKricket]

Just like the title says, the ICPS and EUS for SLS and Orion have disappeared. Don't know if this is intentional or not. If it is, please bring them back.

[shadowmage45]

It is intentional. Those parts were replaced by the MUS configurable tank; the only thing the older parts have that the MUS does not is integrated engines; I felt it was not worth the part-count savings for the engine alone to keep those two single-use parts around (and their large texture sheets).

No they will not be coming back -- you are free to continue to import and use them from older releases, though they will not be supported.