PS has officially announced that the full series will be added to the PS+ member game library this year:
Basic Membership: Dragon 7 will join in August
Second class members: Ru Long 0, Ru Long Ji, Ru Long Ji 2 will be added in August, Ru Long 6 will be added in this year
Class 3 Member (Classic Game Library) : Dragon 3/4/5 (HD copy) will join within this year