Alpha Channel in Eevee? Apologies in advance for the Eevee question... but!...now that the releases are getting more stable, I'm messing around with it and wondering if anyone has gotten an alpha channel/transparency mix shader to work with it. 

Usual setup doesn't seem to work. It looks liek there was a transparency socket at some point, but not now, and plugging the alpha into the transmission does nothing.
Okay, if anyone else is wondering about this, I found an answer on Twitter of all places...there's an Options section of the Materials tab that contains a Blend Mode drop down with an Alpha Blend option (among others.)

Weird that this isn't accessible through the Node Editor somehow (but maybe I'm missing it.)