What ever you do, do NOT be lured into thinking they are thinking about maybe a big exit for you, your interests are not aligned yet and you need to realize that. If there is any IP possible make sure you have provisional patents filed before you talk to them about anything. Even if you don't think it is patentable, force them to either buy you or risk infringing you if they go into competition with you.
Seriously, you have nothing to gain from this distraction if they aren't serious, and if they are serious they will put it in writing for you.