The vivo NEX 2 will likely have 10GB of RAM and a Snapdragon 845 chipset. The information is confirmed by a Geekbench listing of a vivo V1821A device with the aforementioned credentials. Interestingly the vivo in question is also running Android 9 Pie, which would make it the first vivo smartphone on Android's latest software.
According to a related leak, the main camera on the back of the vivo NEX 2 (one of three) will have an ultra fast f/1.3 aperture - claiming the spot of the smartphone with the widest aperture around.
As for the screens, rumor has it the main screen will be a 6.59-inch panel with screen sound casting tech (meaning you'll hear calls through the screen itself, like on the first-gen vivo NEX) while the second display will be a 5.5-incher that will work independently. We know how vivo intends to switch between screens - with a three-finger gesture.
Finally the vivo NEX 2 will apparently come with a smaller battery compared to its rival. This could be due to the space required for the second screen. Of course the information could also be false.
vivo will likely announce the NEX 2 on December 11.