This news is currently only stated for the US - as CBS All Access and Showtime are both only available in this country. However, CBS All Access has been reported to rebrand over the coming year, and then eventually be distributed in Europe. If Showtime has the same treatment, it's possible that we could see other bundles across the world from AppleTV+.
Whilst both channels are geolocked, there are ways to still watch CBS All Access and Showtime from the UK through the help of a VPN such as NordVPN or ExpressVPN. CBS All Access currently airs Star Trek: Lower Decks, the newest animated show in the Star Trek universe.
If you’re in the UK, you can sign up for AppleTV+ for £4.99 per month, or get 12 months included with any new Apple purchase, including the iPhone 11 range, Macs, iPads and more. You can see the full list of qualifying products over on Apple’s website.