We had a false alarm last patch, but I think vectoring is out and DI is back in for real this time. Here's my data. I tested this with Diddy's uair (knock out two birds with one stone, eh?) against Mario from the side platform on Battlefield. This shouldn't be affected by any change in the move's properties or even possibly stage boundaries, the relative effect is what's important.
1.0.2:
Kills with Diddy and Mario at 140 with no DI or right/left DI
Kills with both at 138 with up DI
Kills with both at 142 with down DI
1.0.6:
Kills with both at 178, no DI
Kills with both at 191, DI away (angles far away from Diddy)
Kills with both at 173, DI in (angles straight up)
Kills with both at 176, DI up
Kills with both at 181, DI down
Also I didn't notice any effect with Diddy at 0 in either version but I don't know if it's that rage is gone (probably something we would have noticed) or if rage just doesn't have any effect in training mode.