I've previously heard in various spots, such as the thread below, that we can expect the artificer and revised Ranger sometime in 2018. Do we still expect that to be true? Or were there official words to the contrary somewhere?
I am still expecting what they have mentioned
latest i.e. Alternate Class Features (for all classes, rather than a complete Revised Ranger class) and an Artificer base class.
But of course they've changed their plans before, and can do so again. It's very possible that the gamer base still can't wrap their head around not getting a whole class revision, which in my personal opinion is both unnecessary and potentially damaging, and are still asking for that, which would probably push WotC towards burying the ACF idea. OTOH, if we
do get ACFs at some point, let's prepare to be underwhelmed: they'll probably publish
one ACF per class, and maybe 2 for a couple of classes, but they won't certainly provide an ACF for even half of the existing class features. Not so much because it's hard to design them, but because changing
one per class requires a lot less testing than changing
two and having to test what happens when a PC adopts the first only, the second only, or both.
As for the Artificer class, this obviously requires a much bigger design effort. I think the demand for the Mystic/Psion is much bigger, so it's possible they'll drop the Artificer to focus on the other class. But then also the demand for something Eberron is pretty high, so who knows... I still think they want to design both however.
About my personal preferences, I'd have more use for the ACFs than two completely new classes, and why I really liked psionics the first time in my life when they released the latest Mystic draft in UA, I do not expect to be interested in the Artificer unless they make it a non-spellcaster.