With respect (fuck I have to use that a LOT here these days - check out the UK series "Yes Minister" for an explanation why) since the US nuclear industry has been in close to a state of statis since the late 1970s there will be very little to change. Major players (Westinghouse et al) lobbied hard AGAINST the Clinton era Thorium research and hounded the guy who was running it out of the industry. The nuclear lobby ate it's own children. Far more money has been spent on PR than R&D, a total waste since people do not trust the spin about the older technology and that money could have been spent on developing something worth cheering for instead.
The only reason we have any advances at all is because Westinghouse bought a Japanese company that was doing R&D until they were bought out.
It's so slow moving that pretty well anything designed after the wake-up call of Three Mile Island is going to be good enough today.