Changes in the Object Teams Development Tooling are presented per release:

OTDT 2.5 New&Noteworthy - "Neon" Release June 2016
OTDT 2.4 consolidation release
  no new user visible features
- "Mars" Release June 2015
OTDT 2.3 New&Noteworthy - "Luna" Release June 2014
OTDT 2.2 New&Noteworthy - "Kepler" Release June 2013
OTDT 2.1 New&Noteworthy - "Juno" Release June 2012
OTDT 2.0 New&Noteworthy - "Indigo" Release June 2011
OTDT 0.7.1 New&Noteworthy - Service Release (Incubation) September 2010
OTDT 0.7 New&Noteworthy- Release (Incubation) July 2010