$ENV(HOME) => Array

gistfile1.yml

---
- name: Setup Vagrant environment
  hosts: 127.0.0.1
  connection: local
  vars:
    - vagrantbox: CentOS-6.4-x86_64-v201303090
    - vagrantdir: $ENV(HOME)/Development/ansible/$vagrantbox
  tasks:
    - name: Directory $vagrantdir
      file: path=$vagrantdir
            state=directory
    - name: Vagrantfile
      template: src=templates/Vagrantfile.j2
                dest=$vagrantdir/Vagrantfile

matt@one: ~/Development/ansible/ansible-boxuk/playbooks/vagrant (dev_vagrant +$)
$ ls -ld '['
drwxr-xr-x  3 matt  staff  102 22 Mar 21:22 [

matt@one: ~/Development/ansible/ansible-boxuk/playbooks/vagrant (dev_vagrant +$)
$ ls -ld '['/*
drwxr-xr-x  3 matt  staff  102 22 Mar 21:22 [/Users