Comment Clarification of what ARMv7 means (Score 5, Informative) 279
Lots of people are getting mixed up, and/or saying "big deal Debian already supports it". ARM has a slightly confusing numbering scheme: ARM7, ARM9, ARM11, Cortex-A8 are processor models, whereas ARMv4, ARMv5, ARMv6, ARMv7 are their respective architecture versions.
Pretty much all current ARM devices are ARM9 or ARM11 based (smartphones, Nokia's internet tablets, etc). This means they are too old to run this
The Pandora, and other upcoming devices, are based on the Cortex-A8, an ARMv7 architecture processor and the most recent ARM currently generally available: this is what Ubuntu are targeting here.
Debian's ARM port is for any ARMv4t or higher currently, which includes ARM11, ARM9 and even ARM7TDMI. This is rather suboptimal for chips like the Cortex-A8 which have many, many more instructions available, so Ubuntu are indeed doing something different here.