Nate and I do have to make sure that if this deal falls through... We don't want to have a mob of people with fire and pitchforks calling for one, or both, of our heads because people spent money.
Personally, If people want to learn Unreal Engine 4...Go and buy it. Drop 20 bucks, then cancel your sub. I encourage people learning this stuff. It's a lot of fun, and you learn a lot about how/why certain things are they way they are in games.
However, if you're buying it because you want to contribute to Revival. Wait. I'd hate to have people pony up cash, just for us to get a no-go from above. That is only partially due to the above listed fear of Pitchfork-wielding mobs.
I will warn you, however. Something nobody thought to tell me when I got into learning Game creation. Get into it far enough, and you'll never look at games the same way. You start to look at how you think things were built, and how you might build them better/differently. Seriously, I look at games and I like...see Wireframes and scripts, lol.