Well... we didn't really see anything new, the big shiny "back of the box" improvements like lighting and licensed equipment were featured in previous streams.
When you are already aware of the positives it is much easier to point out some of the smaller negatives, for example - outfielders still fire rockets off their back foot and charge in on hard hit line drives or grounders. Subtle a.i. decisions go a long way into making the nuances of the game seem more believable, so I am a little disappointed in that regard. I didn't see any of the non-linear route running that was shown off in the first stream, but that was probably a result of there not being too many opportunities for outfielders to backtrack.
One more thing that bugged me a bit was the unnecessary barehand catch by the Cubs SS that led to a throwing error. There was no pressure coming from the lead runner and the batter was not even halfway down the line, why in the world would a professional ballplayer even try something like that? I know there is a new speed paradigm for baserunners this year - how about a fielding urgency paradigm next year? I think that is one area of the game that we all agree needs more attention, the situational awareness of fielders.