There's one more feature we'll all want: the records! showing the largest primes so far!
I'll see if I can make a quick implementation inside the client, so you could just query it.
Will super-block report a higher than normal difficulty?
If so, I could find the record-breaking blocks directly this way
Yes, the superblocks will have higher difficulty and the record holder would have the highest, however if more than one of them share the same top difficulty you'll have to decide by comparing the value of the hash of the block's header (in the bit order that is used to generate the base prime), or just compare the base prime for those.