But the new model has a 2MP front-facing camera (up from 0.3MP on the previous version) and works with microSD cards up to 400GB (up from 256GB). You can also install apps to the microSD card if the built-in storage capacity isn’t enough for you.Unfortunately, battery life gets a bump down from 'up to 12 hours' to 'up to 10 hours' mixed usage.
The update is focused on Alexa. With the latest Fire HD 8, it is possible to interact with Alexa anytime. It is not clear if this feature is hardware related - if it isn't, based on Amazon's firmware update track record, then the previous two generations should receive the software feature.
The tablet can also be purchased with a show mode charging dock. The dock charges the tablet and turns it into smart-display when docked. The dock isn't new, as it was released in July 2018 in the US but is only now made available in the UK. In the US there is also a version of the dock for the Fire HD 10.
Interestingly, Amazon UK doesn't sell the dock separate to the latest Fire HD 8 (Amazon US does sell the dock separately). I think Amazon UK want a reason for customers to buy the latest tablet, as the previous generation is compatible with dock. The latest iteration is about Alexa but the previous two generations should get the new Alexa software features. I also think the show mode charging dock will eventually be sold separately or made available through third-party sellers. This means if you don't care about the front-facing camera then there is no reason to get the latest model.