One of the item explicitly mentioned to be on display at this event, called "Tamashii Nations in Yodobashi-Akiba Spring 2010" is G.F.F. Metal Composite Unicorn Gundam, which will be released next Saturday (March 27th).
Also, as reported on Tamashii Web Diary, apart from Unicorn Gundam, more items from Tamashii Nation will be on display for certain, including one first prototype of "Ano" (? - アノ原型). Not sure what that is. ^^; A new product? or the first prototype of Composite Ver. Ka Lancelot Albion (or maybe Gurren Lagann) announced the other day?
Information is Annex and Tamashii Web Diary. Image is from this previous posting.