While we can't confirm that Activision registered these names, it does appear that they're the ones involved. They've made sure to keep the registrant a secret, but we can still see the domains.
SkylandersKaosAlliance.com (WHOIS), SkylandersNanoForce.com (WHOIS), SkylandersSuperForce.com (WHOIS) and SkylandersSwapForce.com (WHOIS).
Looks like we might have the names for the next installment in the series. No surprise that more is on the way! Thanks to Jordan for the heads up.