I decided to test out the finally fixed japanese text input. Opened the game in a normal world, MC in windowed mode. Hit T, the chatbox comes up as normal. I use the mouse, which is now free, to change the input language of Windows from Pt-ABNT2 (I am brazilian with an ABNT2 keyboard) to Jp.
The changed worked fine, the small windows box that converts kana to kanji appeared in the corner of the monitor as normal (hiragana was the chosen input method), I typed in "日本語" as a simple test, and it functioned fine.
After pressing enter, the message was sent normally, but I didn't regain keyboard control of the game. I controlled the mouse, but any text I typed while in the japanese input was being taken by the little Windows box, even though there was no textbox to input anything in.
Screenshots follow. I pressing T won't open the chatbox, it'll just type a T into the Windows kana box, Esc being the only input I tested that worked ( didn't test the F# keys, however).