Still no release date for the PS3 version but at least some interesting facts from the producer Ryan Warden on twitter:
regarding ME1:
"some things (including, but not limited to: texture popping, overall performance) are improved on the PS3"
"well, "new coat of paint" isn't quite fair. But "remake" implies way more. It's... a port. ME1 engine with ME2 PS3 touch-ups"
https://twitter.com/LesPaulDuJour/status/252893678354460672
and rather vague
"We're trying to retain the classic experience, but make some targeted fixes"
https://twitter.com/LesPaulDuJour/status/252892325527822336
but no deeper changes like the new combat system
"it doesn't have ME3-style combat. It plays like the classic ME1"
https://twitter.com/LesPaulDuJour/status/252145685460312064
and the PS3 version is made with help of Edge of Reality (they already helped with the console ports of Dragon Age Origins)
"yeah, we're working closely with Edge of Reality for ME1 PS3. Performance feels really good overall"
https://twitter.com/LesPaulDuJour/status/251762322668933120
Maybe with some of the PC version fixes? From what I understand they at least improved the inventory system and Mako controls in that version (I never played it on Xbox).