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Barkley said:

I think people are looking into this too much, it's useless to speculate on a single letter codename. It does not imply a fusion machine it doesn't not-imply one either. X is used as a codename for many many projects.

In Japan the letter X is pronounced "cross" and it has different connotations from here in the West, where it is mostly considered the go-to representation of a variable. I don't know whether that is also the case in Japan, but the use of the letter as "cross" is certainly worth mentioning when that is virtually the only shadow of a hint we have to go on.