An investigative report by Brian Klug from Anandtech claims that Apple has used the MDM9600 baseband chip in the newly released iPad.
Brian went through the restore .ISPW images and traced entries for the part in the source code (the MSM9600 is codenamed Maverick).
He writes that the chipset "contains UE Category 3 LTE, CDMA2000 1x/EVDO Rev.A (and B), GSM/EDGE, and WCDMA/HSPA+ all the way through DC-HSPA+ 42 Mbps" and is manufactured using a 45nm process which means that power consumption, die size and power dissipation could be improved by moving to a thinner process.
The author ends the article by suggesting that all three tablet variants (Verizon, AT&T and global) use the same baseband chip but with different modules and power amplifiers. We will probably need to wait for the first teardown to find out whether this is indeed the case.
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.