The Unreal Engine 4 is now available for everyone. You don’t have to buy it, you can just download it at their website (Epic Games). You have access to all the tools and when you want to sell a finished game (or another product created with UE4) “Epic Games” gets 5% of your income. Sounds fair.
If you want to download the Engine you have to create an account at “Epic Games”. Then you can download the “Launcher” at first. This Launcher is actually really cool. It is a collection of tutorials, a marketplace with user-content like built cities or a forest, you get news from there, have an overview over your projects and even have a friends-list. I had the UDK before and that was just the development kid but without any extras. The Launcher makes the Unreal Engine more user-friendly and it’s easier to start working with the UE4.
I haven’t tested the UE4 itself (downloading at the moment) and will write something about the Engine within the next days (with a longer article than this one here). Now I am just telling about the new “Launcher”. A very useful feature to create a better overview.
If you want to download UE4 for yourself, here’s the website: https://www.unrealengine.com/blog/welcome-to-unreal-engine-4