Okay, so here are my guesses:

Number 1:

Either just to surprise or for new upcoming champion.

Number 2:

http://4.bp.blogspot.com/-WEykg3v_-H4/VdI8t4SFAsI/AAAAAAAAv7Q/4p4XkmCtX64/s1600/hint4.png

I think this one will be

Number 3:

http://4.bp.blogspot.com/-5iPMPlCjBUo/VdI8tnem79I/AAAAAAAAv7o/_o5fl0VTfuo/s1600/hint3.png

I think this one will be (I hope it is right because he could use one)

Number 4:

http://3.bp.blogspot.com/-IvopTkghhPs/VdI9i5frg8I/AAAAAAAAF7w/gJ7Y5HH5X6s/s1600/memory6.jpg

We already know this one...

Number 5:

http://1.bp.blogspot.com/-d8qiyASZFns/VdI8te9A4NI/AAAAAAAAv7I/F8QaRjwCPuc/s1600/hint2.png

This one might be

Number 6:

http://4.bp.blogspot.com/-69j5cFJzxfs/VdI8tn-0KCI/AAAAAAAAv7M/02Ayh5iAjHg/s1600/hint1.png

I feel unsure about this one the most. It could be , or it could be , or it could even be or

Now, I'm not sure about or since they got new skins recently and GP got a new look and skin.

These are my assumptions.