I'd say the initial firmware did not fare well when encountering actual users, so most of the glaringly horrible software-related issues (reboots or other total fall over dead problems) will be addressed in the next firmware.

There are other functionality shortcomings very common with brand new products that will likely take more then one firmware rev (and/or some third party software) to work out, but none of them are even remotely insurmountable, or would require anything as horrific as jailbreaking on an iPhone