Regarding #2, it's all or nothing by device type within a network. For example, you must upgrade all access points. You can choose to stagger them to cause minimal interruption, or concurrent upgrades in order to get it done faster.
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No. The implementation team will need to let the operational team know when a site goes live so they know if ignore alerts up until that point.
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The 3rd party VPNs will use the VIP and can failover between MXs. Note they can't usually failover between different Internet circuits. Also, note that running third party VPNs through a cellular gateway can be dicey.
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