Features:

General:
- Manual mana tap
- Real deck-builder (or at least a bit more customization)
- In-game achievement browser, not the Steam one (especially annoying with gamepad)
- Manual region selection

Graphics:
- More resolutions and refresh rates without manually editing the config file
- Borderless windowed mode
- V-Sync

Controls:
- Support for a second player on the same keyboard with different bindings without forcing a gamepad
- More customization options

Multiplayer:
- "Real" Co-op, not just Hotseat (against Human and AI)
- Better integration of the voice-chat (5 sec. lag, automatically on without any further notice, no mute option)
- Text chat
- Host being able to set the timer length (Some people have a hard time reacting or to stop the timer)


High:
- Several people are reporting that they can't start the game due to an error regarding system specs (Confirmed)
- Several people are reporting various performance issues (CPU usage, Graphical glitches) (Confirmed)
- Several people are reporting bugged cards (Confirmation needed!)
- Several people are reporting issues with the AI (Confirmed, please look at the link above)
- *NEW* Demo crashes with SLI activated (Confirmation for full version needed!)

Medium:
- *FIXED* Some people are reporting Leaderboard issues (Crashes, Leaderboard depends on the Content Region settings in Steam) (Confirmed)
- Private slots are not private (Confirmed)
- Sometimes when exiting the deck manager the game glitches and leaves you stuck with the main menu background rendering but with no menus being displayed (Confirmed)
- Disabling battle animations mid-game causes bugs with messages being displayed at inappropriate times (Confirmation needed!)

Low:
- If you use your keyboard to access the Steam Overlay while using a gamepad it may totally mess up the controls (buttons not working anymore, etc.) (Confirmed)
- *FIXED* Achievements not properly showing up (might be Steam Community related) (Confirmed)
- *FIXED* After you hosted a game, you can't join or create any multiplayer game (Confirmed by KidGrimm, they're working on it)
- A user has reported a bug with the Logitech RumblePad 2 (Confirmation needed!)
- Several people are reporting that windowed mode won't change resolution (Confirmed)
- Incorrect vertical pixel height in windowed mode at native resolutions (Confirmed)
- *NEW* After ending a match there's a "Review players" button which was part of the Xbox 360 Arcade version (Confirmed)
- *NEW* Nicknames with special characters seem to mess up some graphics (Confirmed)
- *NEW* When playing in windowed mode, the game pauses every time it loses focus, even while loading (Confirmed)
- *NEW* Mentor mode: When looking at the learner's hand and he attempts to play a card when it is not his turn the "Not your turn" notice appears and is not closeable (Confirmation needed!)
- *NEW* Xbox 360 wirless controller not correctly recognized (Confirmation needed!)
- *NEW* Pressing Tab for ending the round interferes with the shortcut for opening the Steam Overlay (Shift + Tab)