I've written about this in some other thread, but for whatever reason, that thread did not get greenlighted by the mods.
There is one thing about elite and especially frontier/FFE, that i haven't seen successfully "copied" in any elite-alike.
And that is the feeling of playing in a gameworld with lifeforms and civilizations, instead of just pressing buttons and interacting with computers (that's why in i.e. the X-franchise, it always felt as if you were the only being alive in the gameworld, surrounded by computers and robots). In frontier, you browse blackboards for job offerings, and interact with people via multiple-choice menus. Heck, for the disk version, they even went as far as procedurally generating character portraits. Then there were newspapers, background lore about HUMANS in the gameworld.
All of this taken together, made it feel as if you travel inside a civilization of lifeforms.... instead of just flying around in some ship, pressing buttons, and using computers. The only game that halfway managed to give this impression was privateer, but then again, for privateer any communication felt highly scripted and of low variety, plus the gameworld was rather small.
Sadly, this one unique aspect about the elite-franchise, which hasn't been reached by any elite-alike, isn't mentioned at all in the kickstarter presentation. Instead, E4 is presented as just another "elite-alike", which indeed brings up the question, how the game presented on kickstarter, is any different to i.e. EVE Online.
Mind you, i don't think that it will actually be just like all the others. I do however think, that E4 is badly presented in the kickstarter article, because the description reads like any other generic elite-alike. It doesn't explain how E4 is unique from the rest of the pack. And that's a shame, because as i wrote above, there are unique aspects about the elite-series, that haven't been copied yet, and which have potential to expand on.