Yes. Go is intended as a server-side language, so HTML/AJAX is the GUI
of choice.
Go comes with an http server and a template language, so making a web
GUI is quite simple.
For anything else, you would have to wait until someone releases a Go
windowing kit. Doesn't look like the core team will, but there are
probably others who would want one.
For myself I can't see the problem with web GUIs - they are an order
of magnitude quicker and simpler to implement than native GUIs, and
the differences between browsers are trivial compared to the challenge
of porting a Windows GUI to Linux, Mac or iPhone.