The following is the Official Japanese PPG (Pentax Photo Gallery), it once shown the name of K-3, together with the name of the "K-5 series", for photo submission under the same camera category! :-o
Via: http://www5a.biglobe.ne.jp/~hu5150/dcl/camera_news/article/pentax/2013/0922_01.html (in Japanese)
Well, the picture was shortly deleted and reverted back now, where only appears the name K-5 series. However, the leaked picture with the original html code with the name of K-3 are captured! (Good job, man!) It surely is NOT a typo this time as the K-30 also appeared at the same time at the adjacent left, as the other category of Pentax' DSLR cameras!
So, the K-3 must be true this time. It is No More Rumour! It is really *Official*! :-D
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Latest K-3 Technical Details (from my Trustable Source)