PhuturePhillies (Jim Peyton) is reporting three additional international signings, as of 4/25 (signing dates will probably change due to MLB review/approval process). All listed as pitchers:
Lozano is a 19-year old RHP, who pitched for Tijuana in the Mexican League last summer:
Mijares I can't find much about, except a Facebook page:
Nothing at all on Petit. When these signings get approved by MLB and posted to the Phils transactions page, we'll know birthdates, countries or origin, etc.