Just the 3 new smartphones coming out this month is really all that's going on at Verizon.
Yes, if you don't currently have unlimited smartphone data, you'll have to sign up with one of the new smartphone data plans if you upgrade to a 4G device. But I saw in another thread that you have a family plan with 3 $29 data plans. If those are unlimited data for smartphones they will be grandfathered into unlimited 4G data when you upgrade to a 4G device. Unless your phone is the one carrying the $10 for 75Mb plan. Then you might call Verizon and ask for unlimited since you have 3 other data plans on the account. They might upgrade you to unlimited 4G. Not sure, but it's always worth a try.