It's the second patch within a few days or so, with patch 1.003 arriving last week. Much like the last update, this latest one comes with no sign of patch notes or any official word from developer Team Asobi, so we're left unclear on precisely what it addresses.
We can only assume the update squashes a few lingering bugs; we saw a handful of people mentioning crashes and visual errors, though these don't seem massively widespread. The issue related to save data appears to have been fixed in the last patch, going by anecdotal information we've seen online.
At any rate, it's worth getting this patch installed to ensure your game is as good as can be. You'll have to let us know if you spot any changes in the comments section below.