There's a couple of spots that get large puddles, mostly the tunnel under Scholls Ferry Rd and some spots between Scholls and Hall.
The worst place is that tunnel (it really isn't a real tunnel, just an underpass-- and it's dark under there, whether it's sunny or cloudy)... the other potential flood zones are more like easily passable puddles.
Caveat: I haven't been on the trail during the worst of winter, this is just what I've noticed this past weekend.
Watch out for clueless people who let their dogs roam off-leash--- my boyfriend t-boned a dog who wandered across the trail in front of him. Luckily for both, Scott was going slow enough that he didn't crash and the dog didn't get injured, but the two teen girls walking the dog were freaked out.
You won't be able to go as fast as you want on the trail, and there's a lot of places where tree roots create some serious bumpy spots, so be careful!