You will also need a new license (unless you have a subscription).
Free plugins (such as Data Exchange 16) will be available on www.esko.com early July.
The trial downloads on www.esko.com will also be updated early July. Until then, the trials will not install or work on Adobe® Illustrator® CC 2015.3 or Adobe® Photoshop® CC 2015.5.
So: If you use any Esko plugin, we strongly recommend that you wait to update your Adobe® Illustrator® or Adobe® Photoshop®, until you have version 16, your plugins and the necessary version 16 licenses.
Updating Adobe® Illustrator® or Adobe® Photoshop®
If you need to update your Adobe® application before you have compatible Esko plugins, then remember the following:
The Adobe® installation program will by default remove the previous version. So, to make sure that you still have a version with working plugins, please make sure to disable Remove old versions in Advanced Options. For more information, see http://adobe.ly/1SkeMvy or check this screenshot.
If you have already removed your previous version of Adobe® Illustrator® or Adobe® Photoshop® and you need your Esko plugins, then you will have to downgrade Adobe® Illustrator® or Adobe® Photoshop® and reinstall your Esko plugins. This blog article from Adobe® explains the downgrade process (it was written for an earlier update).