Now that the US TF Ride has had its advance screening to annual ticket holders, an exclusive item has been bought and reviewed here.

It is labelled as a 1:1 scale Allspark cube, but appears to be smaller than what Sam was holding in the movie.
It is also being priced at US$225 (if it were a Hasbro toy, it would be about $400 here), and is assumed to be a metal casing of a lighter material.
It sounds like it is very over-priced, even for a theme-park exclusive.

Sounds like the Exclusive toys haven't been released at the TF Ride store yet. (Legion Evac & repacked Movie toys)