That is one hell of a track list. Kind of surprised they haven't released the bike list yet, although at this point to me they're almost secondary in a weird sort of way. Hoping it's a little easier to get bikes this time, some of those challenges and various hoops you had to jump through in 3 were a bit ridiculous, although in the end, it turned out it didn't really matter which bike I was riding, I had a good time anyway.
One thing that has always annoyed me about Milestone is their tendency to package recycled content as DLC. If they want X for the full game, just sell the bloody full game for X and stop that nonsense. If they want to still sell DLC, maybe package a WSBK or BSB or historic racing expansion or something, I don't know, just don't make us buy the same DLC or worse, bikes that were previously in the base game (the RC30, for example), again.