You remember when Yahtzee points out how using a Portal reference at this point is kind of like a bloody ten minute fart?
Not even the original game and developer are exempt from this rule. I don't see why people let stuff like this off just because it's Valve. Using an internet meme now three years old is not the way of progress. I wouldn't be surprised if they continued the cake joke either, and we all know how funny that isn't.
Seriously, the more I hear about this game the more I am convinced it can't be good, and I'm almost looking forward to the fanboy rage when they realise that it will never live up to their expectations.