From observations, Roy actually has a smaller sword than Marth / Lucina, but makes up for it with faster frame data. His f-tilt and f-smash seem to be brand new, his d-air is now reminiscent of Ike's, d-throw has virtually no knockback at low percents (allowing for easy follow-ups), and his neutral b, Blazer, retains its OHKO power from Melee when fully charged. His gimmick with the sweetspot on the hilt of the sword may very well be great due to all of these attributes.
Ryu, apart from having final smashes, also comes with the unique quirk of having multiple B specials that are triggered by inputting a combination of buttons - this stays true to how Street Fighter works. His up b seems to be quite sad for Sm4sh standards (think Little Mac).
And with Miiverse and Dreamland 64 being on the way for both the 3DS and the Wii U, it'll be nice to see them on the competitive scene. I see Miiverse as either a starter or outright banned depending on how messages are triggered, while Dreamland 64 will likely be a counterpick given its huge blastlines. Sadly, its visuals are virtually unchanged.