Just reading up on it - sounds quite neat actually (wondering why I haven't tried it before now!)
Spacemacs is a new way to experience Emacs -- a sophisticated and polished set-up focused on ergonomics, mnemonics and consistency.
Just clone it, launch it, then press the space bar to explore the interactive list of carefully-chosen key bindings. You can also press the home buffer's [?] button for some great first key bindings to try.
Spacemacs can be used naturally by both Emacs and Vim users -- you can even mix the two editing styles. Switching easily between input styles makes Spacemacs a great tool for pair-programming.
Spacemacs is currently in beta, and contributions are very welcome.
Does it have multiple split windows? That is one of my favourite features of Vim.
Also would you know if it's easy enough to create a theme?