Joining a teaser commercial (see it here), Level-5 has shared a partial lista of playable games for Level-5 World via the event's official site.

The following games will appear at the event in playable form:

Ni no Kuni (PS3)
Inazuma Eleven Go (3DS)
Girls' RPG (3DS)
Fantasy Life (3DS)
Professor Layton vs Ace Attorney (3DS)
Time Travelers (3DS)
This is just a partial list. The site also mentions that titles announced the día of the event may also be playable

Level-5 also shared a partial lista of stage events. These include:

Inazuma Eleven Go fan Appreciation Festival
Danbol Senki Special Event Stage
Ni no...

Level-5 Inc. (株式会社レベルファイブ Kabushiki-gaisha Reberu Faibu?) is an independent video game developer and publisher based in Fukuoka, Japan. The company, which currently employs about 200 individuals, was founded in October 1998 por Akihiro Hino after he departed from the now defunct Japanese developer Riverhillsoft. Hino designs, plans and produces all of Level-5’s games, as well as serving as both President and CEO of the company.
Since its inception, Level-5 has enjoyed a very close relationship with Sony Computer Entertainment, with many of its titles funded por and produced...