In all fairness, i was joking, but I neglected to put the "lol" smiley in.
I think that was my first 1-word post on GTP and it'll probably be my last.
Anyhoo. . .
Regarding your post in a more serious tone:
Point 1: Rendering for PC or Mac.
I don't think this will happen unless it is for low definition for short periods of time. The PS3 would not be able to handle a 3 minute replay in 1080P with its current hardware. Now something that could be done is they could develop software to view replays on a PC or Mac, then we could get the good bits with FRAPS. Only problem with that venture is it takes away from the time they could be using to fix bugs and do other cool things.
Point 2: Rewinding and/or restarting replays in the middle of them.
This i could forsee in the near future.
Point 3: Slow Motion
This i think may happen in the next update, but I don't know so don't quote it for truth, please.
I think someone already tweeted about Points 2 and 3 to Kaz, and Kaz already mentioned that Point 1 is not available because of the PS3's hardware limitations.
Better?