As far as I can tell, other than reduced output figures, they're still using Theta II engine design. However, they may have revised manufacturing process and improved tolerance... it's hard to say.

Many people with well over 100k don't have any issues, so it's bit of a crapshoot.

Given the cost of this recall, I don't think they're stupid enough to keep cranking out the same engine without having high level of confidence that the issue has been more or less addressed.

With that said, even in its revised state, I doubt this engine will be as reliable as Toyota's AR engine or Honda's K24 engine. Time will tell.