[Cole]

I am sure we have all been thinking this sometime in your life since you've found out about S&Box. I am not going to write a paragraph as that is pointless but this is a serious topic.

What is happening to Limelight when S&Box is released, does Limelight remain on Garry's Mod or does Limelight convert over?

(Obviously anyone is free to answer, I am not asking for an answer but also for people's opinions on the question. Fire away those questions/arguments people!)

[Da Cool Cow]

Not sure if I'd like this change to UE4. I feel like a lot of GMods fun comes from the Source engine and I, myself, have had so many fun and nostalgic memories on it. I guess time will tell

[Soviethooves]

What's S&box?

[Soviethooves]

Oh, Gmod 2 basically. Yea, I hope we switch over when the time is right

[Murdoch Murdoch]

Oh, Gmod 2 basically. Yea, I hope we switch over when the time is right

Not exactly

Found this on PC Gamer

We reached out Facepunch's head honcho Garry Newman to ask what exactly S&box is, if it is in fact Garry's Mod 2, and when we might expect to learn more about it.  
"So this might be a bit complicated," Newman tells us via email. "There's a lot of "is this Garry's Mod 2", the honest answer is "maybe"—but nowhere near that yet. We've basically built our own game engine on top of UE4. We're really using UE4 for its core features, rendering, networking, physics. It's all done in an engine agnostic way. We can lift our system off and put it on the source engine (it actually started on the source engine).
"It's too early to say whether this will turn into a spiritual successor of Garry's Mod, or whether it will even be released as a moddable platform (we might use it internally to make our own games on). But at the moment we're enjoying playing around with it and that's enough right now."