I do not expect EA to release Frostbite to the public. They created this engine for creating their own games. If you remember some of their earlier games used Unreal Engine (Mirrors edge, Mass effect for instance). However the latest versions of these games have switched to Frostbite probably to avoid royalty payments and o get all using the same technologies so they could easily switch between projects.
is also going that route. Their earlier games used UE (Splinter cell, Rainbow Six) and now they have atleast two inhouse engines (Anvil Next and Snowdrop…adn Dunia). But I dont expect to release these engines to a third party.
When you sell an engine you also need to provide support for it.
So in the current situation, I don’t see any chance for us to get our hands on Frostbite or other in-house engines. However from what I’ve been told (a friend of mine had worked with DICE for a while) Frostbite engine prior to Version 2 was very difficult to work with especially for content creators.But with latest versions the pipeline has improved - but I don think its still not as easy as UE4.