Elephone will try their best to get their upcoming P20 model in the good company of high end devices and to achieve that they will equip it with 6 GB of RAM. Of course more RAM the merrier, because higher capacity always allows for more shenanigans. smoother user experience, better multitasking and overall sheer performance for the likes of 4K video or demanding gaming.
Of course the RAM is not the deciding factor for that and the responsibility also rests a lot on the shoulders of the processor. Within the Elephone P20 we will find the Helio P20 so at least the names are in sync and Elephone promises top notch performance for it.
If they manage to come though on all their promises including 5,5-inch FullHD resolution display, Android 6.0 Marshmallow and mainly the 12 Mpix main camera with f/1.7 aperture, then we can have quite a capable phone on our hands. But when that is going to be exactly and for how much is a completely different question.