Let's see, there was MLG. Care to list the rest?
Edit: and looks like RSL will be a ZvZ. So 2 ZvZ finals over 2 months is a lot?
not just finals.... tournaments in the top brackets. from quarters onward, so here's some: ....MLG vs Proleague, recent EG Master Cup, RSL, IPL Fight Club (several), recent ZOTAC, SEA Masters, NA WCS, Oceania WCS, Gigabyte LAN, SCAN Invite, Samsung Euro.....i could go on....
Alright so looking at Liquipedia-
Tournaments in the last 2 months
2012 MvP 1st SoO 2nd Oz 3rd MajOr/Soulkey Not a ZvZ Fest
2012 ESW 1st MaNa 2nd ForGG 3rd Stephano Not a ZvZ Fest
9/12 ZOTAC 1st Fraer 2nd Revival 3rd Hyun Won by Protoss, despite 2 top level Korean Zergs
9/12 GO4SC2 Won by Nerchio Best EU player behind Stephano
MLG Dallas 1st Life 2nd Leenock GSL champ vs MLG champ
Tournaments over 2 months ago
*EG Masters Cup (Team League)
*WCS NA (August 2012)
*WCS Oceania (August 2012)
*IPL FC (is currently being dominated by HyuN, but IPL selects who gets to play in FC). *Gigabyte Lan (June 2012)
*SCAN Invitation (September 2012)
So overall about 4 tournaments have had Zergs in the Semi Finals/Finals. Despite them being either Korean Zergs, or a Top Foreign Zerg.