It was a complete shocker and disapointment to learn that the game has neither of these modes. Instead we're given a bandana and an eye-patch? (fail) Ok, there's Paladin mode, but seriously, I'm halfway to having that completed with all items...So where's the replay value in this game that will keep me wanting to play it beyond 2 weeks?
Combat Arena, for one, is a mode that offers a lot of replay value in my book. I was very addicted to Devil May Cry 4's "Bloody Palace" which even has leaderboards. Bloody Palace mode is what's kept the DMC4 disc in my Xbox even several years after the game came out! I really hope this mode is planned for our future updates.
Boss Rush. It has be added! The boss fights were too epic in this game!
Unlockable Character. Zobek seems like the obvious choice here. I was almost certain the game would have him as playable the moment it was beaten. How will Zobek reach those places that Gabe could only get to via his whip? *spoiler warning* Zobek can float, as shown in the post-credit ending. It would be nice if you could use XP gained with Zobek to purchase combo upgrades for his sword. But I would be happy merely having the entire combo set from the start if development time/resources were short. Unlockable charcters are usually never that "deep", but they are nice to have in a game for something different to focus on and play for a while.
Please consider adding these modes in the future as doing so would surely add endless hours of replay value to an already great game.