Very happy to see a migration tool/service nearing release this is great news!
I wonder why there was no "preorder" done? Seems like that could have generated some cash and helped people who are switching platforms stick around a bit longer without getting desperate and trying some other platform...
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Yes, some of us that are loking to migrate, are here reading about people going to buy their 7th hub and are thinking that they won't get any. I believe a certain priority should be given to new users 
so that the community grows. Hubitat is my first choice to migrate away from SmartThings....but not the only one out there.
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While I'm hoping the new shipment of C-7 hubs will be large in quantity, I would imagine they'll be sold to anyone prepared to fork over the asking price on a first-come first-serve basis.
After all, it is Hubitat Inc., and not the Socialist Republic of Hubitat Inc 
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I have a purely Z-Wave Plus network, will there be any benefit in upgrading my hub to a C7 with the 700 series chip if I don't have any device based on that chip?
Looking at the Aeotec comparison posted above seems like it has higher output power, CPU speed and memory, those may translate into a better performing / stable mesh...
Oh I understand, but what is better for Hubitat Inc, selling hubs to new users who will then want 7 of their own or to someone who already has 8? Also why do people need more hubs(no really, i'm asking to know)???
I, for one, am doing the courteous thing and leaving the first batch of C-7's for the hub-less masses still waiting to make the Hubitat switch.
My change to Hubitat from Wink in May is still too fresh in my mind, and I think that it's prudent to sit on the sidelines until a bulletproof migration procedure between the C-5 and C-7 is developed that includes moving Z-Wave devices without having to re-associate everything yet again.....
People add HE hubs in order to:
-increase Zigbee or Z-wave bandwidth
-segregate misbehaving devices to their own mesh
-use questionable apps that may cause hub slowdowns
-redundancy, back up hub
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I can definitely see this if the migration tool is bulletproof and allows for local/PC backups. This way you can have a fresh unit available if the primary hub goes down and is not recoverable. I for one am not going to act like a caveman and turn lights on manually even for a day! Lol!
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So, does that mean I could add a Nortek Zigbee/Z-wave stick and have two separate Zigbee networks...or does it disable the internal? (I only need one Z-wave)
It disables the internal radio. Only one Zigbee and one Z-Wave network are supported on a hub.
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That was quick. Thanks!
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Theoretically, if one were to buy a certain new hub and migration tool existed for a certain new hub to assist in moving devices from a certain recent hub, would we have to remove and re-pair Z-Wave devices to move from S0 to S2 association, or could you conceivably do it in-place on the new hub?
This would be my guess.
Not the answer I am looking for, but the one I am assuming. I’ve gone so far as to stop pairing new devices.
I vaguely remember that key exchange happens during pairing - that's why I think going from S0 to S2 will require re-pairing. Tagging @jeubanks for the real answer.
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This is correct. During inclusion the encryption is determined and keys are exchanged. To move from S0 to S2 will require an exclude/include dance.
[EDIT]: I just had a thought that it technically "might" be possible... let me ping someone to double validate.
[EDIT]: Message sent. I'll have a definitive answer when they get back to me.
[EDIT]: I see @mike.maxwell has confirmed this already.
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