This is solely based on who is on the roster as of today, and the internal options. Project overall season stats, who will be all-stars, and whatever else stat you feel. I'll start it off.
Simmons - .280/.335/.425 6 Hr's, 55 Rbi's, 15 stolen bases. GG, All-star
Prado - .305/.360/.440 12 Hr's 62 Rbi's, 19 SB's. All-star 3B.
Heyward- .285/.350/.525 31 Hr's 103 Rbi's 32 SB's. All-star, GG, MVP candidate, SS
Freeman - .279/.330/.460 25 Hr's 90 Rbi's Silver slugger
Upton- .265/.325/.470 26 Hr's 85 Rbi's 35 SB's
McCann .270/.340/.465 22 Hr's 82 Rbi's All star
Uggla- .250/.350/.485 33 Hr's 80 Rbi's
Platoon- .270/.330/.435 17 Hr's 64 Rbi's
Medlen 3.15 ERA
Minor 3.35 ERA
Hudson 3.50 ERA
Maholm 3.45 ERA
Teheran 3.20 ERA/Beachy 3.30 ERA
Of course some of these numbers are generous.If we can get anywhere near these numbers, we would be NL east champs for sure lol. Alot of this is based on players getting better, healthier, entering their prime..etc. Feel free to comment, or make your own projections.