http://web.mta.info/mta/news/books/pdf/140127_1030_Transit&BUS.pdf
Service changes start in Part 6, or page 133 of your PDF browser.
The main changes are that X17 Sunday service will become permanent and in June, the B37 will be revived and the B8 and B70 restored to their pre-June 2010 routes. In addition, the B103 will get 3 new stops on added on 3 and 4 Avs, at Warren St, 3 St and 9 Av. Since the B37 will terminate at Atlantic Av and won't go downtown like it used to, those 3 new stops are so that people going downtown can take the B103 instead.
Also, there are the standard routine service increases/decreases to several routes. The Q10 for example, is getting a higher headaway since it uses artics now.