The device, codenamed "Project Juggernaut Alpha", is apparently undergoing internal test at this moment. According to the report, it might be unveiled towards this end of this year or in early 2016.
http://www.notebookcheck.net/Purported-Microsoft-Surface-Phone-specs-leak.148284.0.html
if this is full version window 10 , i think even 8GB ram is not a big deal for this phone. 3GB -4GB is really a dumb PC phone we have.
i dont know why window mobile department not like a PC division ; PC division its really sensitive about the end user demand , free software , free game , free editing software , easy upgrade. but never see this in window mobile.