The image is configured for a stand-alone machine, starting up with an introductory desktop for user glenda, the Plan 9 mascot. If your pi is connected to a network with DHCP service, you will want to copy cmdline-demo-net.txt to cmdline.txt in the boot partition. This will enable networking, and use NTP to set the clock at boot time.
The SD image contains a snapshot of the complete Plan 9 distribution, including source code for everything (kernels for arm, x86, and powerpc; C libraries; and 500+ commands). The system is stable enough to maintain itself – to rebuild the kernel from source on the pi (depending on the speed of your SD card, it should take about a minute), just do:
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cd /sys/src/9/bcm; mk