Mafia Wars has been touting the Rumble in Russia challenge this week with the banner above. It was supposed to start Thursday but now says "Coming Soon" - look like it will start this weekend at some point.
It is essentially a series of Boss fights, like we saw in Beat the Feds and Showdown in San Juan. Four bosses, three levels apiece, each with a Reward that has better stats at each level.
There is also an "Event Mastery Item" - the Ursa Major (Russian for "giant bear", so presumably an Animal) - stats are 60A/115D at top level.
Here is information direct from Zynga:
Welcome to the Rumble in Russia! In this event, players will need to defeat 4 bosses to earn a reward from each boss fight and an event mastery reward item once all four bosses have been defeated. The event mastery reward and each individual boss reward has three different levels (Bronze, Silver, Gold). As higher mastery levels are reached the strength of each reward item will increase. Duplicate reward items cannot be earned once gold mastery has been reached for all bosses. You can request help from your Mafia for each boss fight. Mafia will receive experience points and fight tokens on random occasions.
You must defeat the current boss before the next boss unlocks. Once started, a timer is associated with each boss fight. Each boss needs to be defeated before the timer runs out. When the timer expires, the boss heals. Bosses will not heal if you die during the fight and are forced to leave the fight.
Boss Lenenov – Atlas Torso (Armor)
Bronze (Att/Def): 44/31
Silver (Att/Def): 70/43
Gold (Att/Def): 89/51
Boss Belikov – Crushed Ice (Vehicle)
Bronze (Att/Def): 50/29
Silver (Att/Def): 77/46
Gold (Att/Def): 96/59
Boss Osipov – Big Z (Weapon)
Bronze (Att/Def): 38/54
Silver (Att/Def): 58/82
Gold (Att/Def): 72/108
Boss Bassinov – Civ-4 Carbine (Weapon)
Bronze (Att/Def): 49/59
Silver (Att/Def): 62/87
Gold (Att/Def): 84/113
Event mastery item: Ursa Major
Bronze (Att/Def): 43/65
Silver (Att/Def): 49/92
Gold (Att/Def): 60/115
Here's a Mafia Wars Italy development I noticed this morning - a helpful "calculator" Mafia Wars provides when you accept certain Mystery Shipments, showing you how many more of a particular Italy Village upgrade item you need for a particular Property: