Ah, leaks. I love thee, sometimes. But, the latest from Android Community is that the GT-i9300 is not the unannounced-but-probably-awesome Galaxy S III. Why is that? And how would we know, if it hasn't been announced?
Well, listed in the user agent profile, are stats for the device, where it has a model number of "GT-i9300", which would lead us to believe its the Galaxy S III. This is because the Galaxy S III is the i9200 and the Galaxy Nexus is the i9250... so the logical step to this would be... the i9300. No.
You'll see in the above shot, that the "ScreenSize" is just 1024x600. Sob. What will this device be? Could we expect a smaller Galaxy S III Mini or something? Time will tell, and that time is getting shorter: Mobile World Congress is just around the hopefully higher-res corner.