The new iPad come with 4G functionality etched in (assuming that you buy the non Wi-Fi model). The baseband chipset used is likely to be a Qualcomm Gobi model, part of the MDM9000 family.
Like for the iPhone 4S, the iPad circa 2012 comes with Bluetooth 4.0 rather than Bluetooth 2.1 and Wi-Fi. The 4G (UK version) adds LTE (700, 2100 MHz); UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz).
LTE means that the tablet should be able to sustain speeds of up to 73Mbps up from 7.2Mbps on HSPA on the iPad 2.
Note that the UK version is not compatible with either of the US (Verizon Wireless or AT&T) tablets. Given that 4G has yet to be widely deployed in the UK, the 4G feature is more or less a promising but yet to be fully exploited feature.
Apple says that switching from Wi-Fi to 4G only cuts battery life by one hour from 10 hours to 9 hours on the new iPad, which is the same as the iPad 2 (from Wi-Fi to 3G).
Another improvement is that you can use the iPad as a personal wireless hotspot, assuming that the carrier supports it. How this will be enabled in practice remains to be seen.
The new iPad 4G priced like the old one £499 for the 16GB model, £579 for the 32GB one and £659 for the 64GB.
This article is part of a series where we look at multiple aspects of the new iPad including the processor, the GPU, the screen, the 4G connectivity, the iSight camera, design and battery life. There's also a nifty comparison between the new iPad and the iPad 2.
You can read through our liveblog of the event, one which lasted nearly 90 minutes and also saw the launch of a new Apple TV and the iPhoto App plus a number of major updates.