On 29 June 2015, the Indonesian Ministry of Manpower announced regulation 16/2015 introducing tougher rules for foreigners to obtain a work permit. With the latest changes, each company hiring a foreigner will have to employ at least ten locals (drivers or housemaids not included), thus doubling the previous quota.
Furthermore, expatriates will be limited to a 6-months stay (previously, 1 year) in the following areas: maintenance and servicing, consulting and commerce (a prolongation for the latter two may be possible).
The regulation came into force on 29 June 2015.
The list of affected countries is based on those jurisdictions with more than 10'000 work permits issued (data from news article; cf. Sources).
Update
On 23 October 2015, the Indonesian Ministry of Manpower announced regulation 35/2015 scrapping all relevant migration restrictions announced in the regulation mentioned above. Regulation nr. 35 inter alia scraps entirely the requirement of having a quota of expats to Indonesian workers and the restrictions on expatriates working in the areas mentioned in the second paragraph.
The regulation came into force on the day of its announcement. Hence, this measure is no longer classified as implemented.