I've seen some talk about alternate routes at the new Dragon Trail - Garden, and finally had a chance to check it out myself, after one of the GT League races there.
You can see a definitely road blocked off at turn 1...
It curves out of site, but when you get around to the hairpin, it's hard to miss the road coming right up to the track there, as well...
I think it's safe to assume we'll be getting some sort of variation at this track. Here's a quick layout I drew, showing this sid road's position.
There are also some very interesting service roads all over this track.
This one leads to a fork, for a high road, and a low road..
I'm trying not to hype myself up, but these side roads look like they'd be more fun than the track itself.