If there was a time I thought a Kingdom Hearts character was gay, half the cast would be. I don't know how many times Sora and Riku gazed dreamily into each other's eyes. Roxas and Sora, two dudes, grabbed each other's hands in a similar way to this ending. Roxas then started to gaze at Sora, almost uncomfortably so.
Do they have feelings for each other? No. It's showing their unbreakable bond. This situation could be viewed in a similar fashion.
[spoiler]At this point, I've seen pretty much all the cases. This is the hype period; everyone is looking at this through starry eyes, preaching that Korrasami is canon.
If the hand holding and staring were, indeed, added in the storyboard at the last minute during production, then the primary plan was for them to just be friends; best friends. However, we don't know if that storyboard rumor is true.
Anything could happen.[/spoiler]
Don't get me wrong, I'm not disagreeing with you guys, I'm just stating when all is said and done, it's simply a possibility. Until the creators actually give the official say, we can only dream.