If you open engine manager and edit an engine variant, the boxes next to the stats on the left give market details (mine was showing hyper, super, c/super, GTP).
EDIT: Also found out that cloning an engine has some odd behaviour. Cloned a 1969 engine, it came up as 2016, and had no family or variant details, until I changed the year. Saved it, then went to re-edit the clone, only to find it had overwritten the original variant. (See pic below)
I cloned another engine but it did not show up in the manager, until I restarted the game.
Looking forward to next update.