The texture is from the web and the models too. They had their own license, so i don't think that they are from TurboSquid. Anyway, they are just for testing.
1.) Sunlight is possible as far as shadows from sunlight are possible. However, it's not just about pinning a "sun" somewhere in space and let it create shadows. Shadows have to be tweaked to look good and give the impression of shadows created by the absence of sunlight.
2.) No. It has nothing to do with post processing. It will come in two flavours: Some new methods in a few classes to enable you to do everything needed for shadow mapping on your own and a sample implementation in the util-package that should cover the basics and that should be sufficient for almost any application.
3.) I don't see how you could mix the two...and what do you mean by "you can't tell the difference"? I mean a shadow is...well, just the a shadow. How does it correlates to a post processing bloom effect?