This is Mino (for iPhone). It was made by a company called Xio Interactive:

Tetris Holding has successfully sued Xio on the grounds of copyright and
trade dress infringement. Tetris Holding
has tried this before against omgpop.com's Blockles game, but they settled out of court.
QUOTE
Tetris Holding argues that Mino infringed the following copyrightable elements:
- Seven Tetrimino playing pieces made up of four equally-sized square
joined at their sides; - The visual delineation of individual blocks that comprise each Tetrimino
piece and the display of their borders; - The bright, distinct colors used for each of the Tetrimino pieces;
- A tall, rectangular playfield (or matrix), 10 blocks wide and 20 blocks tall;
- The appearance of Tetriminos moving from the top of the playfield to its
bottom; - The way the Tetrimino pieces appear to move and rotate in the playfield;
- The small display near the playfield that shows the next playing piece to
appear in the playfield; - The particular starting orientation of the Tetriminos, both at the top of the
screen and as shown in the €œnext piece€ display; - The display of a €œshadow€ piece beneath the Tetriminos as they fall;
- The color change when the Tetriminos enter lock-down mode;
- When a horizontal line fills across the playfield with blocks, the line
disappears, and the remaining pieces appear to consolidate downward; - The appearance of individual blocks automatically filling in the playfield
from the bottom to the top when the game is over; - The display of €œgarbage lines€ with at least one missing block in random
order; and - The screen layout in multiplayer versions with the player€™s matrix
appearing most prominently on the screen and the opponents€™ matrixes
appearing smaller than the player€™s matrix and to the side of the player€™s
matrix.
You can
read about the case here and
here.