Board Thread:Fleet's Prepared-ness/@comment-2A02:C7F:9608:CE00:9CFB:B39C:BB51:5C29-20170730121653/@comment-24930367-20170730123125

Either by using viewer (EO, KC3 Kai, and friends) or, like you said, prtscrn into Paint (actually my personal favorite option).

Until there are further confirmation, it's safe to assume that if Warspite makes an appearance, it'd be for all difficulty (just with different drop rate).

If your aim is to get the aforementioned ships, frankly doing it in Class C (ez) is not a bad idea. The good thing about doing it that way is that you're not pressed to farm the map before your actual clearing process, at the cost of higher difficulty rewards. However, higher difficulties sometime do have much higher drop rates so it balances out in the end, I think.