Drupal 8.3.x has entered its release candidate phase with the release of 8.3.0-rc1, which means we will now undertake disruptive cleanup tasks like adjusting coding standards. The main standards change during this release candidate phase will be the official adoption of short array syntax, e.g.:

<span style="color: #000000"><span style="color: #0000BB">&lt;?php<br>&nbsp; </span><span style="color: #FF8000">// Before:<br>&nbsp; // $array = array('foo', 'bar');<br><br>&nbsp; // After:<br>&nbsp; </span><span style="color: #0000BB">$array </span><span style="color: #007700">= [</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">];<br></span><span style="color: #0000BB">?&gt;</span></span>

Work is underway to patch core for this change, which will touch many files, so be aware that you will need to reroll patches for conflicts and adjust them to use the new standard.