I'd be wary of reading too much into a plastic mock-up. I must admit, I was expecting an announcement of joining the Franco-German effort rather than an attempt to revive a home-grown design.
The media are jumping all over this as Britain's new fighter, but if you listen to what Gavin Williamson says, its actually only a concept and is a shrewd political move to show willingness to collaborate. The mock-up is a nice PR item but I feel we'll look back on this in 20 years the same as the BAe P.110 mock-up back in the 80s.
Team Tempest was formed back in April to develop a low-cost UCAS demonstrator building previous work which included Taranis. Since then with all the talk of European fighters the emphasis has obviously shifted to something that can be optionally manned. I wonder how much of TFX is in this design (maybe that's why this mock-up looks so familiar?)
https://www.flightglobal.com/news/articles/team-tempest-pursues-ucas-demonstrator-deal-447301/