I never knew they had a 20$ discount. Learn something new every day.
I don't think they are going to be generous in the beginning of the LTE device launch. Verizon has the biggest and fastest 4G network in the United States and they are well aware of it. They will most likely use this as their marketing strategy until another competitor catches up.
I do believe they will offer packaged discounts but they will be very minor. They have a top notch marketing department and they will use that to their advantage (as they should). They will make a 5$ discount sound like your getting a huge chunk taken off your bill.
I remember when I worked at stop and shop a while back they would raise the prices on a bunch of products and then 2 weeks later they would drop them down to where they were. Then they would put up a sticker tag saying "Save 30%. Was $9.99. Now $6.66". Very sneaky but very effective as well.