Bottom line, there is no reason to buy this game if you own a previous version of Tetris (or 3 or more like Chi and I do). The New Tetris tries to offer something new with the focus on forming squares, but it could be too much of a departure from the norm for Tetris veterans.
After all its different incarnations, Nintendo apparently felt Tetris needed a face-lift as much as Leatherface does. The New Tetris, as it's called, is probably the biggest conceptual departure from the original Tetris theme that any "Tetris" game has gotten. Since it's inception, Tetris has been about clearing the most lines and getting the highest numerical score to see who is the best. In The New Tetris, a high score is still desirable, but it is tallied differently; the actual number of lines cleared are the focus and not points given for each, as in the original.
Shifting the focus over to building world wonders with lines accrued makes The New Tetris the first Tetris in the franchise to reach 'biblical' proportions. Why 'biblical'? Because the sheer amount of effort it takes to build one of these mammoths made me feel like I actually was a slave in Egypt!