I believe we already have support for some network related features through LuaSocket/libcurl. We have support for openGL shaders too, so if you know C/GLSL then you can write your own shaders. We also have support for Lua script.
I think Simon was working on something to allow importing of modules (I vaguely recall him mentioning something about importing something - my memory isn't that great).
He's working on new shader stuff at the minute, box2D physics engine & some other stuff.
Anyway, to answer your question you should be able to create network based features with libcurl to access data from a website server & probably also to be able to store it too, so you could use it for stats or displaying a news feed in-game.