If it comes, it comes. There is nothing Bioware can say -- other that outright confirming it -- that will be taken at face value at this point. They are either obfuscating to fulfil contract obligations or to ensure PC and 360 sales or not impacted, or they aren't. We do not know. Whatever the truth, people will continue to argue until the game is confirmed for PS3, or it slowly becomes obvious it isn't happening. Only time will tell.
Look to Kojima and MGS4 on 360 for a comparison. Many fans were absolutely convinced it would happen. It didn't. Then again, look to Bioshock or the GTA DLC on PS3 for contrary examples. Many said it could never, would never happen. It did. These show we simply can't be sure about anything.
So, to conclude: if you want to play ME, buy it for PC or 360 now. It's worth it. ME1 is some awesome sci-fi RPGing (albeit with many flaws). ME2 is a smashing shooter (with RPGing strapped on, but far less in evidence). If you only have a PS3 and have no desire to pay-out for a 360 or PS3: currently, you simply have to do without. That may not always be the case, or it may. But I wouldn't be betting on ME on PS3, as it's be a pretty unsafe bet, just as MGS4 was an unsafe bet.