LTC + BEAM ?
According to a beam blog post, the Litecoin Foundation approached Beam about possible cooperation to implement Mimblewimble via Extension Blocks on Litecoin.
In short, Litecoin has been looking into adding confidential transactions, and they have been looking for the right tech to build this out with. The Litecoin foundation is now officially considering the Mimblewimble protocol. Beam is a major Mimblewimble coin, and so it makes sense that the LTC folk would be looking to BEAM folk for help.