Pikmin 3 is an excellent game, and NSMBU is decent.

Two sentence reviews for the free games that I've played:

Pikmin 3: Beautiful, quirky adventure with RTS and resource management elements. Gets surprisingly hard and funny.
Wind Waker HD: The greatest Zelda game of all time. In HD.
New Super Mario Bros HD: Moments of brilliance and moments of mediocrity. It's 2D Mario at the end of the day.
Wii Party U: Fun and diverse party game. Least good of the American choices, but by no means a bad game.
Wonderful 101: Pikmin's deranged cousin; brilliantly funny and inventive. Every Wii U owner owes it to themselves to play this game.
Nintendo Land: Another excellent game to play with friends, as with all party games some hits and some misses, but overall a great little package. Pick this over Wii party.
Sonic: Lost World: Dodgy level design, poor controls and bad design choices made this a miss for me. Others disagree.

From the Nintendo of Australia website.

* The 10 Wii U games featuring in the Mario Kart 8 Bonus Game Promotion are:

- Nintendo Land
- New Super Mario Bros. U
- Monster Hunter 3 Ultimate (Wii U version)
- GAME & WARIO
- Pikmin 3
- The Wonderful 101
- The Legend of Zelda: The Wind Waker HD
- Sonic Lost World (Wii U version)
- Mario & Sonic at the Sochi 2014 Olympic Winter Games
- Wii Party U

Is it May 31st in Oz?

That blows, why can't they just give you the same date as the rest of us?

You already have to put up with being the only non-venomous creature in the land of death and now Nintendo take away your advantage of living in the future too? :)

(Note: I have no idea how timezones work.)

Well that's all I needed. 

I'll be pre-ordering soon then.

I think I'll get Monster Hunter 3, it's a toss up between that and windwaker, just need to join club Nintendo now lol

Question, seem as I'm buying two copies of Mario Kart 8 does that mean I get two free games or will it just be a one time thing per console??

You can only register one copy of each game on Club Nintendo. So you'll only be able to receive one code per Club Nintendo account.

However, it does say that the code can be used on any console, so I guess you could set up a 2nd Club Nintendo account (maybe in a relatives name), to register your 2nd copy.

Mmmm I'll look into that :)

Let me know if it works, I've offered my little sister my code (as I have all the games offered that i want)