I'm watching, myself, just out of interest in this precise question. I'll bet it hits a major site within two days, since it's a fairly major release hot on the heels of the PDF policy kerfuffle, and I'm sure someone out there is eager to "stick it to the Man". I'm betting it'll have no bookmarks, no OCR, and be a rush job. With fading nerd rage, however, I'd expect rips to lag further afterwards until as much as a week passes before a major release gets pirated. I'd expect the uncertainty of timing and quality to drive a big enough percentage of would-be pirates to buy it retail and justify the PDF drop.
Interestingly, the pirates have a deadline on crunchy books like this. If they don't get it out between release and DDI update day, the only reason for anyone with a DDI subscrip to DL it is to look at the pictures. I think WotC is working hard not to stop piracy, but to make it not worth the effort compared to a $5-a-month subscription.