Xcode shows iPad Pro has 4GB of RAM; 2GB in iPhone 6S
 

Apple's updated iPhones and iPad Pro won't be in consumer hands for a while yet, but the updated iOS device simulators in Xcode may confirm our wildest dreams strong desires when it comes to RAM. According to developer Hamza Sood, the latest Xcode version exposes how much memory is in its simulated devices. A simulated iPhone 6S or 6S Plus has 2GB of RAM, while a simulated iPad Pro has 4GB.

http://techreport.com/news/29030/rep...b-in-iphone-6s