I can't speak to atom, but have you considered Visual Studio Code? That and VS2015 are tightly integrated with the TypeScript compiler and language service (provides autocomplete, type hinting, go-to definition, etc.).
For sublime, there is a plugin actively developed by Microsoft [1].
For vim, the plugin YouCompleteMe provide autocomplete [2].
Also, I haven't tried it, but there's an Emacs-mode, apparently [3].
There are also numerous other alternatives I'm unfamiliar with.
I'm not sure how this support will be added though. So far the last WebStorm ( which arrived a month ago ) supports 1.6, but definitely not as good as let's say visual code.
Example for that is lack of per module definition files .d.ts and package.json typing a property.
I'm fairly In a mood to switch to visual code or Atom, since I write exclusively typescript nowadays.