In case anyone hasn't seen this yet, the Series 2 YG list was leaked recently.
While the image is slightly cutoff, it looks like 460 is Adam Klapka, 470 is Jackson Blake, 480 is Zachary L’Heureux, and 490 is Aleksei Kolosov.
Likely because of the lower number of debuts, there are only 45 player YGs while the last 4 before the checklist are "Teammate YGs". I'm sure people will have an opinion on that.
It looks like Will Smith was the only YG held over for the Extended Series.