Five percent royalty rate still applies to commercial projects
At last year's Game Developers Conference (GDC), Epic Games made the decision to license its next generation Unreal Engine 4 to anyone and everyone for $19 per month, giving subscribers unfettered access to its complete C++ source code hosted in GitHub. If you sold and/or made money from your creation, you'd end up paying Epic a 5 percent royalty on top of the subscription fee. Nearly a year later, the 5 percent royalty remains in play, but Epic has now removed the $19 per month subscription for Unreal Engine 4.
Tim Sweeney confirms there's interest in porting Unreal Engine 4 to Windows Phone and RT
When the time is right, Epic will make its Unreal Engine 4 platform available on Windows Phone and Windows RT. Exactly when that time will be is still up in the air, but thanks to a forum post in which Epic co-founder and CEO Tim Sweeney responded to a user question, we at least know it's something the company is both interested in and has been working towards to some degree.