Before I post this, I just want to remind everyone that I am not anti-Chrom. I love the guy. That said, we post about him here, because there is no dodging around the fact he is consequential to Robin's inclusion. It has been a goal to consult with Intelligent Systems with successive entries for character ideas, and there is a minute possibility we'll ever have more than three Fire Emblem characters unless they have some VERY good ideas for what to do with them.
A lot of people mention how he is too similar to Marth and Ike, but it goes deeper than that. There are four characters indicative of why Chrom is a horrible idea.
1 & 2) Marth and Ike themselves. But it's not so much the fact they are blue-haired swordsman from Fire Emblem, but rather what has/will happen with the characters in Smash 4. The idea of Chrom being "between the two" is invalidated. Marth (in the demo build) is a slower character, and if Ike follows suit with every other slow character in Smash Bros, he'll become faster. The middle-ground will become too narrow to merit another fighter.
Statistical variation of course in no way defines a character entirely, since someone can move as fast as someone else but still play very differently, but it's worth mentioning none-the-less.
3) Shulk
I can't say I care about this character, but there is a reasonable chance he will show up. The power of Monado and arts of course offer a plethora of gameplay potential. So while one could say "How is he anything like Chrom?", I would say "What can't he do that Chrom can?" What, Aether? Ike has that. That's all Chrom really has, and even the animation in game just uses generic animations. No super powers of any sort. Not only that, Shulk broadens out franchise representation, while Chrom only dilutes it.
4) Mii Fighter
Yes, the Swordfighter is aesthetically very different from Chrom, and the Mii Fighters borrow plenty of moves from other characters. That said, there is no doubt that this little warrior will wiggle its way into whatever gameplay niche left. Being a sword user alone does not make a character similar, but at some point the reservoir of possibilities starts to run dry.
Again, while I do not doubt the leaker had legitimate information at some point, there is a high chance we won't see Chrom at all. This scarcely helps Robin's chances, since not only is Anna and a few others a good contender, but there is a chance Marth and Ike may be it. Whether it's Lucina, Chrom, Robin, Anna, Ephraim or really just about anyone, I remain hopeful for more Fire Emblem representation.
If you love a character other than Chrom, don't lose hope.
If you love Chrom, don't lose hope.