Kirby Super Star Ultra doesn't need it's own page since essentially going the same game. In fact all that will need to be done is to have info added to the Super Star Page about it for the new modes, features, minigames and perhaps differences after release.
Here's something though. I keep seeing Dark Mind being called a renamed Dark Matter. I thought the case was Dark Mind is the mirror world equivalent of Nightmare and Dark Matter, not Dark matter itself.
Dark Matter (ダークマター, Dāku Matā?) is a recurring antagonist of the series. Its main form is that of a planet-sized dark cloud with a single eyeball. It can separate into smaller clouds lined with petal-like extensions. These can possess other beings, putting them under the control of Dark Matter.  At the core of the giant cloud is 0, a giant eye, which controls the Dark Matter. It is a force of negative energy that lives a lonely existence. It is jealous of Dream Land's lifestyle, so it constantly targets it to recreate Pop Star into a dark world where no one can be happy.
In Kirby's Dream Land 2, one small cloud first appears as a masked, robed being, wielding a magical sword. It assumes its general form afterwards. In Kirby's Dream Land 3, Dark Matter attacks Pop Star, and possesses many of its inhabitants. Kirby eventually obtains the Heart Rod, and defeats it by destroying 0. It returns in Kirby 64: The Crystal Shards, where it attacks Pop Star and many other planets. After being repelled from all of the planets, it forms as the Dark Star. It is controlled by 0² (Zero Two), an angelic-looking form of 0 with a halo, and geometric, segmented wings, who is destroyed along with the star. It also appears Kirby and the Amazing Mirror, renamed as Dark Mind.
Also on the metaknight article:
Meta Knight (メタナイト, Meta Naito?) is an enigmatic character, created by Masahiro Sakurai. Meta Knight is voiced by Atsushi Kisaichi in the original Japan, Eric Stuart in the English dub of the anime, and Jay Ward in the English version of Super Smash Bros. Brawl. He follows a code of honor, and usually gives Kirby a sword before they fight to be fair.  He is called Kirby's rival, and while Kirby often battles him, they have worked towards the same goals in the past.  Little is known of his background other than his rivalry with Kirby, and how they share a similar appearance. [ It is widely thought that he is kirby's father as in the anime, it gives away many clues such as in the episode when knuckle joe appears. He wields a powerful sword that can create small tornados, wears a blue cloak that tranforms into a set of wings, and wears a light blue-silver mask. In some games, his mask is removed, revealing that he looks like Kirby, except that his body is blue and eyes are white. In Kirby and the Amazing Mirror & Kirby Squeak Squad, Meta Knight has a purple body.
Meta Knight is often a boss in the games. In his first appearance in Kirby's Adventure, he fights Kirby to keep him from taking a piece of the Star Rod to keep it out of Nightmare's hands. He helps to defeat Dark Mind in Kirby & the Amazing Mirror by giving Kirby his sword, Galaxia.  In Kirby: Squeak Squad, he works to keep the chest containing Dark Nebula out of Kirby's hands.  He is a playable character in a special mode of Kirby: Nightmare in Dream Land and an unlockable character in Kirby: Canvas Curse. Meta Knight appears in Super Smash Bros. Melee as a trophy and also appears as a playable character in Super Smash Bros. Brawl, where he utilizes his sword as his main weapon.
Meta Knight is also a regular on the anime series Kirby: Right Back at Ya!. He is revealed as a member of the same group as Kirby, the Star Warriors, and is a high ranking and respected member of the Galaxy Soldier Army which fought against the armies of Nightmare, though he ended up being the only surviving member. He works for King Dedede, but is in truth an ally to Kirby and only stays with the king to keep a close eye on his schemes. He wields a golden, spiked sword called Galaxia which has some significance to the show's plot, and acts as a mentor to Kirby, occasionally training him or defending him when needed, but tries to make Kirby learn for himself so he may eventually be able to defeat Nightmare. He is also well known for hating people who lack common sense.
Stuff In bold I found misleading or odd, or wrong
B1: I didn't see any point where meta knight hinted at being Kirby's father
B2: Last I knew the sword was only called Galaxia in the anime and Brawl, also the sword is different than "Galaxia" in amazing mirror. (appearance, behavior)