Yeah it was meant to be end of may or early June, though I read that the delay is due to some issues with ICS on the tegra 2 processor, as was shown with the Asus Transformer.. but I'm sure they will fix it soon!
If I have to take a guess I would say its still going to be some time.
Samsung needs a reason for people to buy the 'Tab2'. The specs of the 'Tab1' is superior to the new one and if it had ICS the new one would not sell.