You should be able to just add another site to your homestead.yaml file. From the Laravel docs (http://laravel.com/docs/4.2/homestead):
Configure Your Nginx Sites
Not familiar with Nginx? No problem. The sites property allows you to easily map a "domain" to a folder on your Homestead environment. A sample site configuration is included in the Homestead.yaml file. Again, you may add as many sites to your Homestead environment as necessary. Homestead can serve as a convenient, virtualized environment for every Laravel project you are working on!
You can make any Homestead site use HHVM by setting the hhvm option to true:
sites:
- map: homestead.app
to: /home/vagrant/Code/Laravel/public
- map: myapp2.com
to: /home/vagrant/Code/myapp2/public
hhvm: true