Well I mean really. Saying Chrom isn't different enough but saying Lucina is fine is a crock. She looks EXACTLY like Marth, unless you take into account Marth's costume change for SSB4. But regardless, they still look incredibly similar.
Chrom looks like Marth and Ike? Well...maybe his hair? Other than that he looks nothing like Marth, and shares one arm with Ike. That's it.
Additionally, Roy has just as much chance as Chrom to be semi-clonish. Denying that as a possibility is just as bad as a Chrom supporter such as myself denying the possibility that that can be Chrom's fate as well.
(DISCLAIMER: As I continue to type, understand that I know why Sakurai picked Roy and Ike, so STFU for a second.)
Assuming Sakurai goes to Intelligent Systems again like he has for the last two Smash titles, who do you think they're going to suggest to him? Remember, when he asked them before, they showed him Roy, then Ike, who were both at their respective times the newest lord in the Fire Emblem series. (not saying that's why SAKURAI picked them, but that it's probably why Intelligent Systems suggests them)
Chrom (and Lucina) are a big thing for Intelligent Systems right now, getting spots in Monster Hunter (huge in Japan) as alternate costumes. But why not some other lord? Oh wait. Awakening is the newest title. This is marketing at its finest.
I have no issues with Roy getting in. I would be fine with either Roy or Chrom, because gameplay wise they essentially offer the same, they're the most likely, and overall I like them both. But I truly feel that Chrom is going to get in whether some of us like it or not.