It depends what do you mean by GUI: if you're asking if it is a desktop ready release, then no, it doesnt come with GUI, but at any point you can install XFCE/Gnome/KDE on it and turn it into a desktop system. However, you might want to look at PC-BSD which is a FreeBSD based desktop oriented release. If you're asking if it does have graphical installator then yes, it does have ncurses based installator.

FreeBSD targets servers, so after installation you will simply get a text console.

You can install X11 though which by itself is a good experience because it makes you understand how given components interact with each other. They also have great handbook which explains standard administration. Here is section that tells you how to configure X11: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x1...

Yes, but you'll need to use the PC-BSD distribution instead of the (much smaller/barebones) base FreeBSD distro.