I'm sorry if this has already been posted but i don't remember seeing it anywhere....
When your typing in portrait mode and you highlight (not click) a letter and hold your finger on it the actual letter pops up bigger (sort of like on the iphone)
This feature seems kind of buggy because not all the letters will work and most display only 1 letter while some like for me the "U I" will pop up both letters and i can choose which one to click.