Apple has started rejecting applications which tout their price in the name, icons, screenshots, or previews.
If a developer attempts to submit an application for review that contains the word “Free” in the name of the app, they will be presented with an error message.
Full error message:
"Your app’s name, icons, screenshots, or previews to be displayed on the App Store include references to your app’s price, which is not considered a part of these metadata items.
Please remove any references to your app’s price from your app’s name, including any references to your app being free or discounted. If you would like to advertise changes to your app’s price, it would be appropriate to include this information in the app description. Changes to your app’s price can be made in the Pricing and Availability section of iTunes Connect."