Unlikely any of these will be in URBAN WARFARE but here is what am hoping for will come down the road for it-
Valkyrie
Ostcout
Ostsol
Pheonix Hawk
Wasp
Stinger
This is probably impossible but would be cool to have infantry who attack from buildings. Just imagine the cockpit hits or a suddenly dispossesed mechwarrior all thanks to a lowly foot soldier with a portable srm 2. VTOLs and smoke rounds would also be highly interesting.
Current release battlemechs i will definitely be using in URBAN WARFARE are-
Firestarter, ah the thought of a city in flames just like in The Kentares Massacre of 2796

Jenner, fast and flexible perfect for turning tight corners slipping like a cheetah from enemy crosshairs.
Panther, powerful, swift and even comes with jump jets for some Death From Above delight.
Stalker, now i can live the cover scene from the game box of CITYTECH.
Blackjack refitted with energy weapons and flamers for lethal close up action.
Shadowhawk with it's heavy hitting autocannon 5 to indulge the sniper in one's heart.
Hunchback because we all need a little horror in our lives as it suddenly appears at the end of a dark street.