Brillouin Energy Corp In Berkeley California has another Low Energy Nuclear Reaction (LENR) method in the development and proving stage. The new method comes at fusion from a different path than the Rossi E-Cat.
"A very different take on getting past the Coulomb barrier."
I started reading this pdf, but it looked a little too technical for me, so I stopped. If it turns out that they are correct, then all power to them. I still think that it is possible to get hot fusion on the nano scale.