Hold on to your grandfathered plans folks, it's going to be a long ride!  This morning, much to my chagrin (and I'm willing to bet yours too), AT&T has announced what we've assumed to be the inevitable - tiered data plan pricing.  I think it's safe to say that this was expected, but my impression was that Verizon was going to be one of the first and that it would be a result of the expense of implementing their LTE network (in other words, I wasn't expecting this so soon).  But according to BGR, that's not going to be the case at all.  On June 7th (the first day of WWDC, interestingly enough) AT&T's new data plans will go into effect.  The new plans are as follows (courtesy of AT&T):

DataPlus – 200 MB of data for $15 per month

• Designed for people who primarily surf the Web, send email, and use social networking apps.
• On average, 65% of AT&T smartphone customers use less than 200 MB per month
• If you use more than 200 MB, you'll receive an additional 200 MB of data usage for $15, replenished as often as necessary during the billing cycle.

DataPro – 2 GB of data for $25 per month

• Designed for people who regularly download or stream music and video, or use other high bandwidth applications
• 98% of AT&T smartphone customers use less than 2 GB in a month on average
• If you exceed 2 GB, you'll get an additional 1 GB of data for only $10. Each time an additional 1 GB is used up during a cycle, you will automatically receive another 1 GB at the same low price.