Please don't waste time to native export or 3D. What we really need is "Third-party extensibility of the editor" and "Project modularity features".
People don't understand that when they have a 3D option, the engine won't going to make a 3D game itself. 3D is complicated. I think 90% of people who want 3D in C3 are not going to make any games with it. We don't even have a decent game in 2D but we want 3D. And with "Third-party extensibility of the editor" someone can make a plugin like Q3D with 3D editor and it would be close to official 3D support. You can check Q3Ds forum page and see how complicated it is.
Native export doesn't mean your object/effect/particle heavy games perform well on any platform. You still need to think about performance and adjust your game. And I don't think people going to buy native export modules. Check GMS2 module prices, it costs a lot.
People say other engines have HTML5 export, too. Yes, they have but they are really bad.
BTW I really like the GM2 look and I got the beta but If I'm going to use GMS2 I would prefer GML. It seems simpler than DnD. Their DnD system is still bad compared to C2's event system.