Leaning forward on tiptoe: We are definitely seeing this, and she has a very cute little "tippy-toe dance" that she does when she's showing off, but which is different from the sort of Devo-Jerk kind of dance she does to music.
Digging and building: I see more digging than building, but not too much of either. She is not crazy about getting dirt on her hands.
Speech: She's pretty verbal, and uses many words appropriately. I hear that early talking runs in the family. She says "bless you" when someone sneezes, "thanks" when she's giving you something (though, oddly not when she receives something), and "Oh, shit!" when she spills a whole glass of milk in her lap (I don't know where she got that...). She uses the milder "oopsie" or "uh-oh" for water spills and other accidents, as well as for deliberate acts of entropy. She can name all her immediate relatives and most anything she eats or wears, and repeats everything she hears. Everything.