There's literally NO WAY Uncharted 4 is coming out this Christmas. Big budget games like that typically launch around a year after their first big reveal, and Uncharted 4 hasn't even had THAT yet, it's had a small teaser trailer just so people buy PS4s safe in the knowledge that at some point, there'll be more Uncharted. They'll give us a big gameplay reveal at E3 and likely launch in the first half of next year.
Gran Turismo 7 likely won't be their "big game" next year, either. It takes Polyphony a long, long time to make a Gran Turismo game, and if they're able to release GT7 next year, it'll likely be little more than a slightly-nicer-looking GT6, which won't exactly do much to impress people. Any updated GT6 they do release will do fairly well, but I highly doubt they'll have been able to create a real GT7 in that time.
