There's been previous discussion over this:

https://news.ycombinator.com/item?id=18507817

Take what you will from it. I'm not sure they will kill it, but I don't know why they need to maintain two editors either, then again they already maintain Visual Studio as well. I think it would be nice to see how both teams push their editors, but I feel like over the long haul it will be some VIM vs Neovim type of this. Additionally, VS Code will focus on strongly supporting Microsofts tech (via plugins), while Atom will focus on GitHub to some extent.