After 21 years and 48 games, Radical Entertainment has ceased development of its own games. On 28 June, 2012 the studio had a significant reduction in their staff due to the low commercial success of Prototype 2. The remaining few employees will work on supporting other existing Activision projects.
The PC version of Prototype 2 will release as scheduled on 24 July, 2012. However, there won't be any new games or the continuation of the Prototype Series..
I waited until a confirmation about this situation was provided by Radical themselves, hence the delay..