Mining will be implemented in 2.5 update, so in max two months.
I'll take that with a bucket of salt and see what has been shown in about two months.
That's the spirit! People think I'm joking when I say SC is a 2020 game. I've fully convinced myself that it is, so now the day to day stuff doesn't really bother me. All I want is S42, which I'm fairly certain we're getting in a year / year and a half, and that's what I'm looking forward to.
Having said that, the stuff you're talking about - mining, Hornet Ghost gameplay - doesn't seem to be that far away.
Neither did Star Marine seem to be that far away this time last year. I talk about faithfully and patiently waiting with a ton of cynism. I can't take CIG - its management, not its artists or coders - too seriously anymore, as the visible rift between their impeccable looking assets and the trainwreck (from a technical PoV) they call the "Alpha 2.0", which I tried to play last week, is simply too gaping. That 2020 estimation may be about right - that's both, "still" and "only" four years away after all. Not much time to beat something into shape with the scope of Star Citizen that's not progressed past a very unstable alpha, which has next to none of the high level features working that the game promises to offer ("high level" as in a meta game build on simply roaming around the world).