Sorry but that's simply not true. It was Sun and now Oracle that purposely chose an incompatible license for ZFS. Nothing to do with the GPL here. Your complaints are like the people that buy up land around an airport, build houses, and then complain about the noise.
Anyway, if you read the fine articles you'd discover that what Ubuntu is going to do is include ZoL modules in their kernel packages. This takes advantage of GPLv2's aggregation clause which lets you ship non GPL binaries with GPL'd binaries because they aren't linked together (think an OS distribution). Once the modules get loaded, that taints the kernel but since it's the end user that initiates this by choosing to use ZFS, there's no copyright violation. ZoL has always operated this way, actually.
In other words ZoL will not be compiled into the kernel, as to do so by Ubuntu would be a license violation. But Ubuntu plans to ship and support the binary kernel modules. Sounds eminently reasonable to me. Hopefully we'll see this approach adopted by other distributions, athough ZoL is not that hard to get running at all.