UPSC will release official notification in this regard on 17 May 2014. Usually UPSC conducts Prelims exam in May / June. The exam will be held in August, as per the new schedule.
The UPSC has decided the dates considering the forthcoming Lok Sabha elections. Candidates will get more time this year and prepare for the examination.
Prelims 2013 exam was held in June 2013. The results are likely to be announced soon. UPSC releases examination schedule every year in advance. For more details, see www.upsc.gov.in .