Basically what Derda said: At the moment that is all still too uncertain to invest any time in it. The Domain is still twitter.com, so technically nothing has changed, except that they changed their logo and not even that has been finished completely. There are still a lot of official Twitter pages that use the old logo and colors. For the text sometimes they use X, for the most part it still says “Twitter” all over the place. So we will wait, until they have figured it out for themself first.
But of course: If someone wants to invest the time, feel free to do so. Basically we need the new logo as SVG code (make sure it is free to use with no legal strings attached) and the three color variants in hex (main color, secondary color and wcag color). We then can simply change the few lines of code in the shariff-twitter.php file:
// Colors.
$main_color = '#55acee';
$secondary_color = '#32bbf5';
$wcag_color = '#115A92';
// SVG icon.
$svg_icon = '<svg width="32px" height="20px" xmlns="https://www.w3.org/2000/svg" viewBox="0 0 30 32"><path fill="' . $main_color . '" d="M29.7 6.8q-1.2 1.8-3 3.1 0 0.3 0 0.8 0 2.5-0.7 4.9t-2.2 4.7-3.5 4-4.9 2.8-6.1 1q-5.1 0-9.3-2.7 0.6 0.1 1.5 0.1 4.3 0 7.6-2.6-2-0.1-3.5-1.2t-2.2-3q0.6 0.1 1.1 0.1 0.8 0 1.6-0.2-2.1-0.4-3.5-2.1t-1.4-3.9v-0.1q1.3 0.7 2.8 0.8-1.2-0.8-2-2.2t-0.7-2.9q0-1.7 0.8-3.1 2.3 2.8 5.5 4.5t7 1.9q-0.2-0.7-0.2-1.4 0-2.5 1.8-4.3t4.3-1.8q2.7 0 4.5 1.9 2.1-0.4 3.9-1.5-0.7 2.2-2.7 3.4 1.8-0.2 3.5-0.9z"/></svg>';