Beginning August 22, 2018 the legacy version of Forms will be phased out. If you have not already converted your any created Google Forms over to the new version you can start doing so now.
To convert a form to a new form, go to your form in edit mode, and you will receive a prompt to Upgrade. Click on Upgrade, and it will convert the form and you can then change your theme, add a header, etc.
Beginning November 1-21, 2018 any legacy forms not converted by the owner to the new forms, will be automatically converted by Google (including those not edited or receiving responses within the last year).
The new version of Forms has many different features, including:
fonts to create forms that match your desired branding.
answer to the question (for example Forms will suggest it checks answers to questions asking for a website
Beginning October 23, 2018 Internet Explorer 10 will no longer be supported. Click here for supported browsers.