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Here is a Python 2 script that generates the session ID needed to log in with the new launcher.

import urllib2
import sys
import getpass
import json

if len(sys.argv) != 3:
        username = raw_input('Username: ')
        password = getpass.getpass('Password: ')
else:
        username = sys.argv[1]
        password = sys.argv[2]

data = {
        "agent": {
                "name": "Minecraft",
                "version": 1
        },
        "username": username,
        "password": password
}

req = urllib2.Request(url='https://authserver.mojang.com/authenticate', data=json.dumps(data), headers={"Content-Type": "application/json"})
json = json.loads(urllib2.urlopen(req).read())

username = json['selectedProfile']['name']
access_token = json['accessToken']
profile_id = json['selectedProfile']['id']

session_param = 'token:%s:%s' % (access_token, profile_id)

print username
print session_param
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