As of 2018, Red Orchestra 2 and Rising Storm still have separate Steam pages despite providing the same game and content. The worst thing I can say about Red Orchestra 2: Rising Storm is that not enough of you are playing it. 35450 Rising Storm/Red Orchestra 2 Multiplayer.
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If you purchased it before September 2014 you can pay a small upgrade fee to unlock all the Rising Storm content, otherwise you can only play as a rifleman. Contains full Rising Storm content as well D-Day Anniversary 2016 Update for Heroes of the West. 32469 Monkey Island 2 Special Edition: LeChuck's Revenge Pre-Order. Rising Storm includes all of Red Orchestra 2's content and is available free for owners of the original RO2 who purchased it after September 2014 (in fact it's included in all the latest updates so you don't really have a choice).
Playing Rising Storm/Pacific Theater content is as simple as joining a server hosting it (both games share the same server browser) they will have the letters RS at the beginning of the map name. It adds the American and Imperial Japan factions, a new armament of weapons and 4 new maps: Saipan, Betio, Hanto, and Iwo Jima. Despite being advertised as a new game or "stand alone expansion", Rising Storm is more or less an enhanced version of Red Orchestra 2 with the Pacific Theater added.