Looks like the Updated CKEditor package in Data Bridge does not include the Scayt plugin, also in researching, I found that the CKEditor 4 version in Data Bridge contains a bug with the Scayt plugin.
I will log a bug for this to have it corrected in the next update.
you can fix it by going to the CKEditor Site and downloading the most recent version.
on this page:
click the CKBuilder button. From the presets list, choose Full. In the plugins section, make sure that the Spell Check as you type plugin is selected.
in the skins section, select Kama.
In your DW Site, rename the webassist/ckeditor folder then copy the downloaded CK Editor file to webassist/ckeditor.
from the old webassist/ckeditor folder copy the ckeditor.php, ckeditor_php4.php and ckeditor_php5.php files to the new ckeditor folder.
then edit the webassist/ckeditor/config.js file and add the following line:
config.extraPlugins = 'scayt';