I read the essays on geography and archaeology in his book last night. He says that we shouldn't probably ever expect that there will be a single archaeological find in the Americas that links back to Lehi et al. That this group was likely just too small to have any impact on culture. They were completely subsumed and likely adopted the language, tools, pottery, food of the people they combined with.
I think the only possible game-changer would be finding another set of gold plates somewhere. Chances of this? Infinitesimally small.
These guys are going on an excursion to Oman. Chances they will find anything that directly links to Lehi, even if Lehi existed and they are in the right spot? Essentially zero. They may find evidence of Hebrew influence or settlement, but that's about it.
http://ldsmag.com/major-announcement...his-bountiful/