It's been a while since I've had Latin class (with a large side order of Roman history), but didn't Marc Antony find out about the plot the night before from one of the Liberatores? Depending on exactly when Caesar dies the 14th, Marc Antony either knows everything that would have gone down the day after or the conspirators get away thinking divine will was on their side.
If Marc Antony never hears of the plot, that means no bloody civil wars and no attacking Brutus for refusing to give up Cisalpine Gaul and giving Octavian the opportunity to consolidate his power. Rome would be a lot stabler, Marc Antony still in control as consul, and Octavian without the advantages he had IOTL.
If Marc Antony knows of the plot? I couldn't say. I think was pretty willing to make a treaty with the assassins in order to stabilize Rome, so maybe he'd be even more reasonable if the conspiracy came out after Caesar had already died of other causes.