Here are some screenshots from it. This confirms that The Eye of Timaeus will be a Spell Card:
It's obviously incredibly difficult to read, but the Wikia suggests that it will simply be a Fusion Summoning effect that helps you summon Dark Magician Girl the Dragon Knight, also pictured in the ad. We can expect more details for this set to come in at a greater pace after Premium Gold hits shelves this Friday.
03/27/14 Update: The Japanese Yugioh website has profiled The Eye of Timaeus, giving us both a clearer picture of it as well as a blurb that effectively confirms its effect text:
By sending a “Dark Magician” monster from your side of the field to the Graveyard, you can Fusion Summon a Fusion Monster from your Fusion Deck that lists that monster as a Fusion Material! And this card has a Rule that always treats it as “Legendary Dragon Timaeus”!
Parallel releases are the best thing for spoiler-lovers! Note that, in the original article, they take time to point out that nobody has ANY idea what the phrase "this card is also treated as Legendary Dragon Timaeus" means right now. Konami, you little teases. My guess is that Timaeus will exist as a Dragon-Type monster in addition to this Spell Card and his Knight form, but there's no way to know for sure until the spoiler comes out. Anyways, fingers crossed! This set is definitely exciting so far.