While it's been known to exist for some time now, Red Storm has officially announced their add-on pack for Rogue Spear, titled Urban Operations. Here's a description from the press release, which has some details:

This add-on pack is a counter-terrorist team’s worst nightmare: an urban setting. In Rogue Spear: Urban Operations, team RAINBOW now faces its most dangerous missions yet with every stray bullet putting innocent lives at risk. Due to the public nature of these missions, the secrecy of the RAINBOW organization is also at stake as the team fights against the most deadly terrorists the world has ever seen. Luckily, John Clark & newly appointed intelligence officer Kevin Sweeney will be there to guide the team through these intense situations.

Urban Operations will include fantastic new spaces with new game types for each one, all set in famous cities around the world. Players can also look forward to new multi-player spaces as well as new weapons types and five classic levels from the original game, Tom Clancy’s Rainbow Six.