(I'm answering the question about GbE but just realized the subject diverges from the stated title of this thread... probably should move this to a new thread with a better name)
In theory, yes. In practice, the PCIe lanes on the Joule use the same pins as the USB3.0 port, so you can have one or the other, but not both at the same time. You COULD add an external PCIe-USB3.0 adapter to get both PCIe and USB3.0, but it probably makes more sense in most contexts to use a USB3.0-to-GbE chip.
ASIX makes a chip if you are making your own board,
but you can also find external adapters that use this chipset for about $15:
I have not tested this particular adapter myself yet but intend to. Based on my previous experience with ASIX chipsets, Linux drivers should not be a problem (above Amazon page in fact says "Functionality built into Linux kernel from 3.9 onward (compile required for 2.6 - 3.8)"). Also note that multiple GbE adapters should be feasible.
This message was posted on behalf of Intel Corporation
I think that McCool posted an awesome answer for your question, by the way thank you so much McCool.
Regarding the question in the subject, we don't have a specific date of release, so I can't answer your question but we hope to release it soon, so please be aware in the community and the updates about the Intel Joule Platform.
Have a nice day.