Number I'll be watching (acknowledging that some of these guys probably won't play):
Offense:
QB#10 Garoppolo
RB#35 Gray
RB#28 White
RB#33 Lewis
RB#39 Cadet
WR#17 Dobson
WR#13 Gibson
WR#82 Boyce
WR#14 Harper
TE#88 Chandler
TE#85 Bequette
G#69 Mason
G#63 Jackson
C#60 Andrews
T#71 Fleming
Defense:
DL#92 Brown
DL#99 Easley
DL#90 Moore
DL/LB#93 Sheard
DL/LB#48 Grissom
DL/LB#74 Flowers
DL/LB#42 ****son
DL/LB#70 Johnson
LB#49 Morris
LB#53 Martin
LB#55 Freeny
LB#58 Fleming
CB#21 Butler
CB#26 Ryan
CB#31 Brown
CB#24 Fletcher
CB#28 Roberts
CB#22 McClain
CB#35 Jean
CB#25 Swanson
S#27 Wilson
S#37 Richards
S#30 Harmon
I must have listed the majority of the roster, but I suppose that says more about the roster than it does my watching interests. There's some wide open competitions for third down back, depth at receiver, DLine, linebacker, and safety as well as the entire cornerback position.