> Does this mean that this accounts for at most 2 OID requests with the following IPv6 addresses?
Yes, if you say you support 2 OID requests (i.e., NumNSOffloadIPv6Addresses is 2), then Windows may send those 3 addresses, packed in 2 OID requests. (You might see more addresses than 3, since Windows may send down the *previous* temporary address.) Windows won’t exceed the number of OID requests that you claim to support, and you are obviously not expected to succeed any requests beyond the supported number.
In other words, are we required to generate NA to NS requests for the temporary address?
Yes. This is actually particularly important for Windows 8 and Windows RT in connected standby.