I know Grunt a bit better, but as I explore Gulp I like it a lot. In the future we may switch, but I'd need the Gulpfile to do everything the Grunt one does.

Probably because next week Gulp will stop begin the new hotness and there will be something else.

Yes the whole space moves quickly. The current choice in tools in the recroom "tool belt" is not meant to be unchangeably set in stone. FWIW, Ember CLI is an interesting piece that would connect well to the core Ember framework as well.