The iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max have been announced, but what has not been announced, because Apple never reveals these details, is the actual size of the battery and the amount of RAM they have. However, now we could know these details anyway.
According to @OnLeaks (a reliable leak), the iPhone 11 has 4GB of RAM and a 3mAh battery, or 110GB of RAM and a 3mAh battery in the iPhone XR.
The iPhone 11 Pro apparently has 6GB of RAM and a 3,190 mAh battery (4GB of RAM and a 2,658 mAh battery in the iPhone XS), and the iPhone 11 Pro Max has 6GB of RAM and a 3500 mAh battery (4 GB of RAM and a 3174 mAh battery in the iPhone XS Max).
For those who care about these details, # Apple never officially shares, it seems: # iPhone11ProMax = 6GB RAM + 3500mAh (Xs Max = 4GB RAM + 3174mAh) September 12, 2019
If so, then all three phones are updates in terms of RAM and battery size, although the interesting thing is that the iPhone 11 Pro would have a larger battery than the iPhone. iPhone 11, despite a smaller screen and despite the fact that the iPhone XR is a larger battery than the iPhone XS.
However, this corresponds to Apple's claim that you can read up to 18 hours of video on a single charge on the iPhone 11 Pro and only 17 hours on the iPhone 11.
Of course, although this information apparently comes from "official certification platforms", there is always the possibility that it is false.
Conflicting reports
In fact, a listing on Geekbench 4 (a service that evaluates the performance of phones) for a phone that is supposed to be the iPhone 11 Pro lists only 4GB of RAM, so there is no need to ask the relevance of the Specifications.
For what it's worth, the list includes a single score of 5,472 and a multi-core score of 13,769. Both scores are very high. They are significantly superior to most products in the iPhone XS range or any other Android device. So even if the iPhone 11 Pro has only 4GB of RAM, you don't have to worry about performance.
Via GSMArena and TME