During its "new iPad" event on Wednesday, Apple said the tablet would have hotspot capability, but only if the carrier allowed it. A mobile hotspot feature on either a smartphone for tablet means that the device simulate a wireless router to other wi-fi enabled devices, sharing its cellular data capability with them, particularly handy when you have a 4G LTE device like the "new iPad."
AT&T has confirmed, via its customer care Twitter account, that the AT&T "new iPad" will not support tethering (or mobile hotspot). They do say that "if this changes," they will Tweet the news. AT&T will have the following data tiers for the "new iPad": 250MB @ $15, 3GB @ $30, and $5GB @ $50.
Meanwhile, Verizon is doing the same thing with the "new iPad" that it does with its other tablets: hotspot service is included in the data plan. The Verizon "new iPad" will have the following data tiers: 1GB/month @ $20, 2GB @ $30, 5GB @ $50, and 10GB @ $80 (these are the same as pricing for other tablets on Verizon except that the iPad gets a special 1GB tier).