They're still aiming for a first release of the phones in Spring 2019 (this is from the newsletter, not the blog post)
But it will have a i.MX 8M SOC [1] and more than 2GB of ram [2].
The dev kit has a 720 x 1440 5.7" screen [3] (I assume this is the final screen).
[1] https://www.nxp.com/products/processors-and-microcontrollers...
[2] https://puri.sm/posts/june-1st-last-call-for-librem5-devkit/