At this point, if Nintendo doesn't care about Famitsu leaking, and it has Isaac, I'm going to take it. I'm tired of wondering if he's in. I want closure! K. Rool getting in didn't worry me much because the DK series is already in Smash. Golden Sun, however, is still in the air. I will still be extremely hyped for the trailer regardless because I'll be able to see how he works and see an awesome cinematic trailer too. So, it doesn't change my hype for Isaac one bit of its leaked. Just more assured.
However, it's very possible that Nintendo DID contact Famitsu to delay or change the issue. It would make a lot of sense why Nintendo don't seem that worried. Also they could be changing the Direct too. Who knows?
Edit: Spelling