the Wikipedia article about it, if there is one
Proposes a topic that has come up in the news and deserves its own identifier: it gives the topic a name, says what kind of thing it is, and links it to the Wikipedia article it is the primary topic of. The topic gets a stable IRI here and now, so it can be referred to before - or without - a Wikidata item ever being created. If an item is later created, record it by deriving a new version of this nanopublication that fills in the 'is the same as' field; the absence of that field is what marks a proposal as still open, so no claim about a missing item ever goes stale. News coverage normally belongs in its own nanopublications, published with the separate 'Reporting news coverage of a topic' template, so that coverage accumulates as independent contributions by different people rather than being owned by whoever defined the topic. The 'is covered by' field here is a convenience for the sources the proposer already has in hand at the moment of proposing; both routes are counted the same way.
short ID for the topic, e.g. "omegacat-bh-2"
a short description, as it would read on Wikidata