I'm glad to hear that you like Defold. I'll try to address at least some of the questions/concerns you have, and maybe @sicher can add to my answers as well.
User created plugins - any ETA? I assuming I could implement many of my other wish items with this compatibility.
- The new editor will allow you to create your own editor plugins. Level editors, importers, visual timelines, data input and many more things. If you mean plugins that you can distribute for other users to include in theirs games, not tools to improve the editor itself, then you can already do this via library projects (although we need to add support for read only libraries as well)
LuaSec / OpenSSL to support TLS 1.2 to implement secure sockets (TCP).
- Yes, this is not supported. We do have luasocket in the engine, but not LuaSec. This is the first time I hear anyone mentioning this.
Apple Game Center / Google Game Play Services / Amazon Game Circle
- We are looking into integrating one or more of these. No ETA.
Native Text Boxes / text input? Really surprised I couldn't find this.
- Native text input is supported, but not native text boxes. You can create your own text field and activate the native virtual keyboard of the device. Some details here.