In addition to releasing new packs, the "regular" games in GTO Trainer packs can now be used in "play" mode which lets you continue to play out the hand even after making a non-GTO play. This means that the software now shows you your showdown and non-showdown winnings by hand, session and in aggregate which can be a useful way to spot if you are playing to passively or to aggressively relative to GTO.
Some other new features include some quality of life improvements such as table layouts, displaying bet sizes in BBs, etc as well as the ability to play entire hands from preflop through to the river which I show how to set up in this tutorial.
If you're interested you can download the software for free here: http://simplepoker.com/en/Solutions/?partner=gtorangebuilder