I don't think so. My reasons:
-The first game won't be released on the PS3 (it's published by Microsoft).
-The first 2 games are connected. Also, if you play the first game and you use the same data for the second game, you will be able to see your choices from the first game making effect on the second game and this is one of the biggest focus in Mass Effect (choices).
-Mass Effect is an old game, most of the people who really wanted to play this game already bought the first one for the x360 or PC.
-This is a trilogy and if they can't release the first game on the PS3, they probably won't release the other 2 games on the PS3 because the PS3 wouldn't have all the story. How can you have a trilogy with 2 games?