Shofu posted a video of him destroying a dark pit as luigi. I can't put the link in here because I don't have 10 posts yet.
It seems luigi is basically the same as brawl. His upsmash range is still excellent, and he looks even more erratic than before.
Could be a few changes due to knockback, because it doesn't seem like jab to upB is the same as in brawl. It seems to work more on aggressive, spammy opponents. Still looking forward to destroying people with luigi though. He's excellent for KOing at low percentages.
Do we know anything about the luigi cyclone? Can it still travel upwards?
Also, with the new ledge physics, should we be using the down taunt as a KO move?