gistfile1.txt

$ grep ember bower.json 
        "ember": "1.*",
$  head -1 bower_components/ember/ember.js 
// Version: v1.0.0
$  bower update ember
bower ember#~1.0.0              cached git://github.com/components/ember.git#1.0.0
bower ember#~1.0.0            validate 1.0.0 against git://github.com/components/ember.git#~1.0.0
bower ember#1.*                 cached git://github.com/components/ember.git#1.2.0-beta.1
bower ember#1.*               validate 1.2.0-beta.1 against git://github.com/components/ember.git#1.*
bower jquery#>= 1.7             cached git://github.com/components/jquery.git#2.0.3
bower jquery#>= 1.7           validate 2.0.3 against git://github.com/components/jquery.git#>= 1.7
bower jquery#>= 1.9.0           cached git://github.com/components/jquery.git#2.0.3
bower jquery#>= 1.9.0         validate 2.0.3 against git://github.com/components/jquery.git#>= 1.9.0
bower jquery#>= 1.8             cached git://github.com/components/jquery.git#2.0.3
bower jquery#>= 1.8           validate 2.0.3 against git://github.com/components/jquery.git#>= 1.8
$  bower info ember
bower ember#*                   cached git://github.com/components/ember.git#1.1.0
bower ember#*                 validate 1.1.0 against git://github.com/components/ember.git#*

{
  name: 'ember',
  version: '1.1.0',
  main: [
    './ember.js'
  ],
  dependencies: {
    jquery: '>= 1.7',
    handlebars: '1.0.0'
  },
  homepage: 'https://github.com/components/ember'
}

Available versions:
  - 1.2.0-beta.1
  - 1.1.0
  - 1.1.0-beta.4
  - 1.1.0-beta.2
  - 1.1.0-beta.1
  - 1.0.0
  - 1.0.0-rc.8
  - 1.0.0-rc.7
  - 1.0.0-rc.6.1
  - 1.0.0-rc.6
  - 1.0.0-rc.5
  - 1.0.0-rc.4
  - 1.0.0-rc.3
  - 1.0.0-rc.2
  - 1.0.0-rc.1
  - 1.0.0-pre.4
  - 1.0.0-pre.2
  - 1.0.0-pre

You can request info for a specific version with 'bower info ember#<version>'
$  head -1 bower_components/ember/ember.js 
// Version: v1.0.0