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Please remember to back up your data prior to upgrading your systems. As with any Preview software, this is not the final version of the software. You will not be able to perform a full upgrade from Windows 8.1 Preview to Windows 8.1 RTM (The final release). You will however be able to migrate all your data to Windows 8.1 RTM.

You have successfully applied to Windows 8.1 Preview Virtual Install Fair and your status is Pending.

Each user CAL permits one user, using any device, to access instances of the server software on
your licensed servers. With the User CAL, you purchase a CAL for every user who accesses the
server to use services such as file storage or printing, regardless of the number of devices they use
for that access. Purchasing a User CAL might make more sense if an organisation’s employees need
to have roaming access to the corporate network using multiple devices, or from unknown devices,
or simply have more devices than users in your organisation.

Assuming the stack is setup as an actual stack (Master, Backup, member, member), and that there is an LACP trunk with 1 port on 1 switch and 1 port on another back from that stack to wherever else in the network it goes, the network is decent enough at that point.

But you would need to do an LACP group from the server to 2 different switches in the stack if you wanted to mitigate a switch failure. Otherwise, if the switch hosting that server died, the other switches would be fine but you'd have to physically move the server to a new switch.