PhuturePhillies did a speculative post last week on this topic:
The two GCL teams makes me think there will be more players repeating GCL this year too so they can play every day. We should also have a college-heavy draft with fewer top picks and HS signings this season, which means lots of the draft will go to Williamsport (echoing Squire).
I wonder if we see more than 3 or 4 players from the 2017 J2 class though. Luis Garcia is probably a given. Victor Vargas is supposed to be pretty polished so I expect him. Not sure who else though I imagine the extra roster spots might give us incentive to bringing over any $400K+ signee (Carlos Betancourt, Cesar Rodriguez, Israel Puello).
No idea if the visa rules have been updated. If they haven't, we'll see more college players than usual at GCL.