Sony%26rsquo;s grand plans for a two-part GT HD, featuring downloadable, hi-def GT4 content on the one hand and an authentic GT5 taster on the other, has bitten the dust. What started as "Vision GT" - a quick %26lsquo;n%26rsquo; dirty demo designed to show off the future - has, via GT HD, become GT HD Concept. Available only as a free 630Mb download from the PlayStation Store, it%26rsquo;s a small, but free, look at how GT looks in glorious high 1080p definition-o-vision. And it%26rsquo;s free. So you can%26rsquo;t really complain. Or can you?