I think everything the G10 engine was. Mini-Cars/trucks, tuk-tuk, utility pumps and gensets, ultra-light aircraft, boats, more boats, maybe some motorcycles?. There seems to be a few.
We have to keep in mind, this is intended to be an inexpensive engine with a volume production to support that. The cost/unit rate puts it in competition with a sizable market of small engine applications which (at this level of quality) hasn't had to compete with this low of a cost. I'd say it potentially could be more lucrative for the engine as a profit center than what Elio autocycle would provide.