The fact that Sony hasn't said anything suggests one of two things:
1. They are considering how to replace the game for launch, either using something like Knack as PSN+ title or something else.
2. They are still considering what to do with the game, such as perhaps they can do a GT prologue approach or release part of it on PSN and continue to develop it in the following months.
Personally I don't think its as simple as the game is delayed, if they are going to do it, they are going to do it with some good news.
Now let me say, having played Forza at EG, it was probably an old demo, but that wasn't looking that great either (those recent screenshots did not match what I saw of the game menus).
The question i would ask, what would be worse... releasing a game that isn't finished and in a poor state or delaying it? Personally I think its bad for Sony if they have to delay - it's bad PR whatever way they spin it, but if its needs work, they will get less hassle if its a better game than releasing it early?
At the moment I have KZ, BF4, FIFA and AC4 on order (did have watchDogs also)... so those four games are going to cost £160... then there are a few games I am getting on PSN.. also getting Flower for free.. So I'm probably in at about £250 games wise and thats probably at least 8-10 games. Not forgetting adding some free to play games (if they release on time).... of Course people have different tastes but on the whole you are getting a console because you are a gamer, if someone states there are no games on the PS4, then I'm afraid that person is a tool. There is enough games on either console to suit "Gamers" initial needs.
As for next year... seriously, the consoles are not even out yet, there is no need to worry about nexts years games. I still wonder why people want so many exclusives released from a company in one year... 3-4 exclusives a year with some smaller PSN supported titles is fine... Sony will hit that no problem. Add that into the fact there are many 3rd party games coming out... I do wonder where people have all this time to play so many games. I have about 50 PS3 titles i havent even started yet.