Route Changes:
http://web.mta.info/nyct/service/planned_servChanges_BxM2.htm
Schedule Changes:
http://web.mta.info/nyct/service/planned_servChanges_BxM4.htm
Service Changes:
http://web.mta.info/nyct/bus/schedule/xpress/x063cur.pdf (new 12 minute headway/20 shoulder)
http://web.mta.info/nyct/bus/schedule/xpress/x068cur.pdf (15 minute period reduced to the 5 PM hour only).
http://web.mta.info/nyct/bus/schedule/xpress/x017cur.pdf (20 minute periods on Saturdays and Sundays; sucks how service ends smack at 8:30 PM though)
http://web.mta.info/nyct/bus/schedule/xpress/x021cur.pdf (X21 too popular: new 20 15 minute headways
So far all express, there should be some local bus changes too that weren't mentioned on the MTA site.