EX5 might be fully tied to shenzenaudio, and it also seems like a double down on branding, since the DX3 pro+ has become very popular, so changing the product name to a more recognized line might be a good idea to persuade potential buyers that arent hardcore into this hobby and know every brand and product on the market and are researching more superficially.
I dont particularly like the case, it might look better on full black tho, and i also liked that topping was reusing existing tooling from the a30/d30 on the ex5, as i percieve this as the brand being able to offer a more agresive price on the product while "wasting" less money on superfluous changes that arent as important on this price range.
My guess is that it might be in the 250-350$, on the lower side of that range if the ex5 stays on the market, and on the higher if it gets superceded by the dx5.