I have not made the jump to 4.3.0 yet but things have changed a bit. I would have a look at the examples from
Java Persistence with Hibernate Second Edition EARLY ACCESS (2013, Hibernate 4.3, JPA 2.1)
This book is written by the creators of Hibernate.
Get them here:
http://jpwh.org/examples/
Specifically look at how things are bootstrapped now.
In the zip go to environment/src/main/java/org/jpwh/env/HiberateSetup.java
You can find a very simple cfg.xml in helloworld/src/test/resources
Make sure to note the DOCTYPE