As for Zone of the Enders HD Collection, it's a collection of Zone of the Enders and Zone of the Enders 2, natch. Little beyond its existence was given, outside of a tentative 2012 launch window. It'll also be available on both the PS3 and Xbox 360, with the former version supporting the new Transfarring feature -- though in what way we're still trying to get clarification on. Update: Our own Mike Schramm is on-hand at the Konami event in LA and asked for clarification on the Transfarring feature in ZOE HD. "Wait for future announcements," a Konami representative replied. Looks like we'll have to wait for that clarification!
The Silent Hill Collection will feature only Silent Hill 2 and 3, touched up in HD. No exact consoles were mentioned.