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<p>Considering our limited human resources and time constraints, it is hard to give definitive and accurate estimates of the milestones we are going to release.</p><h2>Groovy 2.1</h2><p>Groovy 2.1 is the latest stable version of Groovy.</p><h3>Feature set</h3><ul style="text-align: justify;margin-left: 25.0px;"><li style="margin-left: 20.0px;"><strong style="margin-left: 0.0px;">offers full support for the JDK 7 “invoke dynamic”</strong> bytecode instruction and API for improved performance,</li><li style="margin-left: 20.0px;">goes beyond conventional static type checking capabilities with a <strong style="margin-left: 0.0px;">special annotation to assist with documentation and type safety of Domain-Specific Languages<span>,</span></strong></li><li style="margin-left: 20.0px;">adds <strong style="margin-left: 0.0px;">static type checker extensions</strong>,</li><li style="margin-left: 20.0px;">provides <strong style="margin-left: 0.0px;">additional compilation customization</strong> options,</li><li style="margin-left: 20.0px;">features a <strong style="margin-left: 0.0px;">meta-annotation facility</strong> for combining annotations elegantly.</li></ul><h3>Releases</h3><ul><li>Groovy 2.1 beta: end of December 2012 <img class="emoticon emoticon-tick" data-emoticon-name="tick" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/check.png" alt="(tick)" title="(tick)" /></li><li>Groovy 2.1 RC: early January 2013 <img class="emoticon emoticon-tick" data-emoticon-name="tick" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/check.png" alt="(tick)" title="(tick)" /></li><li>Groovy 2.1 final: end of January 2013 <img class="emoticon emoticon-tick" data-emoticon-name="tick" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/check.png" alt="(tick)" title="(tick)" /></li></ul><h2>Groovy 2.2 (Q3 2013)</h2><h3>Feature set for consideration</h3><ul><li>Class-loading-less compilation <br /><ul><li>using ASM when needed, to avoid loading/initializing classes needed during the compilation</li></ul></li><li>Stub-less joint compilation<br /><ul><li>to avoid various problems with the stubs and the various compilation phases</li></ul></li><li>Static traits or mixins<br /><ul><li>but dependent on stub-less joint compilation issues</li></ul></li></ul><h2>Groovy 3.0 (Q1 2014)</h2><h3>Feature set for consideration</h3><ul><li>New Meta-Object Protocol dedicated to fully leverage &quot;invoke dynamic&quot;</li><li>Rewrite the Groovy grammar from scratch with Antlr 4</li><li>Retrofitting Groovy closures to accommodate JDK 8 upcoming closures for interoperability</li></ul><h2>Groovy 4.0 (Q1 2015)</h2><h3>Feature set for consideration</h3><ul><li>No concrete plans at the moment</li></ul><h2>Other topics we could consider for later Groovy</h2><ul><li>add static &quot;trait&quot; capabilities</li><li>compiler related:<br /><ul><li>investigate the integration of the Eclipse joint compiler to replace the Groovy stub-based joint compiler</li><li>investigate making the groovyc compiler multithreaded</li><li>Incremental compiler</li></ul></li><li>a treturn keyword or dedicated AST transformation for tail calls for closures and methods</li><li>ability to pass expression trees / AST nodes as parameters (see C# 4's own expression tree)</li><li>lexical categories</li><li>a symbol concept, a bit like Ruby's :symbol, or like Java interned strings</li><li>co-routines and/or generators</li><li>pattern matching</li><li>parser combinators</li><li>a native template engine compiling to AST (faster, correct line numbers for error reporting, optimized outputting, etc.)</li><li>...</li></ul>