Up to 28 signees now - all of them now appearing on the MILB Transactions Page.
I've updated the list in the top post. Note that I've left the "Nationality" for Ramon Marquez blank; his MILB player page says he was born in Phoenix, AZ. I'm not sure what's going on there. Possibly dual citizenship, raised in "not the United States," regardless of his citizenship. He may be the older brother of Diego Marquez, who is listed as Venezuelan - but that's just a flat-out guess on my part.
Also... the vast majority of these guys are 16 or 17 years old. This is a change from recent past years, where we saw the Phils signing a significantly larger percentage of 18, 19, 20 year old kids.