A while back, Crytek UK had two unannounced projects on the go, and then they revealed Homefront 2. This left them with one unannounced project. Now they have two unannounced projects, which means they've picked up something else between the reveal of Homefront 2 and this point.
Plus, we've got the rumour of an upcoming announcement that will make audiences 'go bananas'.
I don't know. But as long as Crytek UK are still working on secret projects, and they haven't said TimeSplitters isn't going to happen, then I still have hope.