If you don't know about the Tales series, it's a long-running franchise of action RPGs published by Namco that dates back to the late SNES days. They're generally known for their bright, colorful graphics, fantastic English dubs, and stories that viciously deconstruct common RPG cliches and tropes.
As for how it relates to Klonoa, well the people at Tales Studio are actually huge fans of the little guy and have tossed him cameos and references left and right. Presea gets a costume of him in Tales of Symphonia (and there's a statue of him in Symphonia 2), he's a summon in the original Tales of Hearts and in Keroro RPG, Mieu in Tales of the Abyss might as well be named "Mini King of Sorrow" and one of the villains gets turned into a Nahatomb look-alike, and Tales of Vesperia not only has a music box that plays the Breezegale theme, but the character Karol gets a Klonoa costume and is even voiced by Kumiko Watanabe in the Japanese version.
And now it seems he may be getting another, although one that's actually integral to the plot rather than an extra.
Recently announced was a new Tales of the World game for 3DS, which are essentially non-canon crossover titles. In this one though, the story takes place in a dream world, and the heroes from the past games are summoned to it from the waking world by a pair of dream guardians who can take on smaller forms to help. Right away this sounds like the lost plot to Klonoa 3, but it gets even more overt: the name of one of these new guardian characters is "Nahato," a.k.a. the same name used by everyone's favorite four-eyed nightmare in Klonoa Heroes.
Could this be connected in some way? Is this how Nahato transformed from a hero to the ultimate villain? Might Klonoa himself make a cameo in playable form? Will this game even get localized (probably not ;_;)? For the time though, I'm certainly hyped! And if Klonoa himself does end up having a presence in the story, it could give the little guy a big popularity boost due to Tales' massive fanbase in Japan and its constantly expanding presence here in the west.