Welcome to cruise-chat, Fezzek.
If you've been on the Sovereign twice then you mostly know what the Monarch offers since they are sister ships. The Monarch does have a small sushi bar (extra fee) and Bolero's Bar which offers mojitos, caipirinhas (my favorite), latino atmosphere and music. The Windjammer has the Jade area with Asian dishes, and they also have Sorrento's pizza (not that great in my opinion). Monarch has not been upgraded with the Johnny Rockets diner.
They may do a short shipyard period when the Monarch moves to the east coast but it will be short and for a freshening up only.
As you know, the standard inside and outside cabins are 119 square feet. Good enough for a short cruise.