These are the projections (note - they clearly will not get this many AB in the majors this year). Belt is currently with the AA Richmond Flying Squirrels, but the other four are in Fresno AAA:
Jesus Guzman: 358 AB, 41 R, 96 H, 14 2B, 12 HR, 41 RBI, 25 BB, 51 K, .269/.316/.412

Brett Pill: 430 AB, 42 R, 102 H, 24 2B, 12 HR, 57 RBI, 19 BB, 60 K, .239/.272/.380

Tyler Graham: 274 AB, 41 R, 84 H, 17 2B, 2 HR, 29 RBI, 18 BB, 45 K, .307/.339/.397, 30 SB, 9 CS

Emmanuel Burriss: 185 AB, 14 R, 48 H, 7 2B, 0 HR, 11 RBI, 7 BB, 19 K, .258/.284/.302, 5 SB, 6 CS

Brandon Belt: 144 AB, 15 R, 39 H, 6 2B, 5 HR, 24 RBI, 11 BB, 31 K, .274/.328/.483

Other notable names that I didn't do calculations for:
Conor Gillaspie, Richmond Flying Squirrels, .292/.342/.419

Thomas Neal, Richmond Flying Squirrels, .293/.361/.437

I have no idea whether any of these players will be called up. The Giants do appear to have a promising future, though, in terms of hitting.