I was actually having a similar issue when I was deciding whether or not to get it a little while back.
Though, it's identical to the 2010 Megazord (Which everyone and their mother reviewed), except the Tyrannosaurus's legs, the Mastodon's back, and the Triceratops's and Tiger's tails are metal instead of plastic. So outside of more weight, shiny metal (Rather than dull plastic), and the chromed sword, it's the same.

My wallet, it's producing so many tears this year. Damn you Bandais, damn you.

No, it actually has more paint, shiney stickers and more accurate selection of stickers.

I just can't find clear, attractive "SOMEONE SELL ME ON THIS FOR GOD'S SAKE" pics.

Ah. I never owned the original 2010 Megazord.
http://linearranger.com/ToyGrid-Rev/PR20Toy04
This review takes 5 pictures of each zord at multiple angles.

Nope. Take a look at the head for the Sabertooth Tiger on both figures. Same goes for the legs and tail of the Tyrannosaurus. That was my impression is that it was the same thing outside of the diecast and chrome pieces, but there are A LOT of differences.

I saw megaforce black key

im still wondering how the keys will flip automatically? with a button or just flicking it?

I don't see anything wrong with the keys. I think they look cool. In fact, I may end up collecting the keys.