Forgot about this thread.
Burj al alam will actually be 484m high, from their website.
Some bad news, the al rafi complex was cancelled because it wasn't given approval due to its height. This is probably because it's under a cap due to the airport. Instead there will be a 55-storey tower.
There's a good chance al durrah will suffer the same fate because it's in the same area.
For those wondering about park square tower it most likely bit the dust long ago since this was to be twice the height of the al rafi and also closer to the airport.
Also this is not confirmed but apparently najd tower was cancelled and the guys building "le reve" (the most way out of your league tower in dubai) have bought the plot. There has been nothing from najd tower for a year so will take it off the list too.