My reasoning as to why they seem to be marketing the speedway more is because they hired an outside studio to work on the racing mechanics. By showing you videos of characters driving on the speedway, it also gives them an easy way to add "By the way, we hired (enter company here) to work on the racing mechanics, so they're 10 times better now." Toy box takeover sounds fun, but I personally didn't like Escape from the Kyln and Brave Forest Seige because I found it too repetitive.. I wish there was more cutscenes with animation, and that it was more puzzle/Platforming then constantly button mashing enemies. I still have yet to find all of the sidekick armor from both games too... I don't have the patience to check every chest I pass.
As long as Toy Box Takeover is a step above the old toy box expansion games, I think I'll like it just fine (and it sounds like it will be WAY better just from videos I've seen).
8 Featured Toy Boxes. Toy Box Summit 2015 Attendee.