The holdup here is:
#1) Rogers has competition to deal with this time. They don't want to release their plans early, and have Bell/telus/etc modify their 'scheduled' plans to beat rogers, so everyone is going to wait till the last minute. Contradictory to this point though, Rogers released the plans last year approx 12 hours before launch, when they were the sole carrier. (AT&T seems to announce their plans, etc, weeks in advance since they are the only carrier though)
#2) Remember when Rogers released their plans for the 3G a week before launch? All they got out of it was bad press due to being stingy on data, etc. So now, the closer they release the plans to the 30th, the less time the press will have to bash rogers and company.
#3) Why exactly is rogers in a 'rush' to release these plans? What do they have to gain? Have you noticed that Apple put nearly $0 into advertising the iPhone 4? They know people will line up to buy it no matter what, so rogers doesn't even have to release the plans at all. I wouldn't be shocked if they said "sorry, we're not releasing our plans out loud publicly.. come in store to see them on launch day!", and people would still go and it would be sold out.
I'll be surprised if we hear anything by Wednesday, i'm expecting some sort of announcement Thurs. night, between 9 p.m and midnight.