Update: According to the Orange County Business Journal, this proposed project consists of a 15 story office building.
Looking at the City of Anaheim's Planning Information webpage, Master Number: DEV2015-00084 indicates a "conceptual development review for a new office tower". This is located at 2400 E Katella Avenue in Anaheim's Platinum Triangle District. Currently, there is an existing 12 story office tower known as Stadium Towers Plaza. Accordingly, the proposed tower would be the second office tower in the Stadium Towers office complex. Details about the height and amount of floors are not yet released.
Map of 2400 E Katella Ave.:
Stay tuned for more updates!