Don't know if everyone else saw- the Census has released the County population estimates for July 1, 2009. Of course we will have a more accurate picture of demographics when the 2010 Census is complete, but here is the most recent estimate for OKC's MSA:

Oklahoma City, OK MSA
2000: 1,095,421
2008: 1,207,519
2009: 1,227,278

2008-2009: +19,759 (+1.6%)
2000-2009: +131,857 (+12%)

Note that 2008-2009 was the largest numerical population increase of the decade for the metro.

Broken down into county-by-county estimates:

County/2008 estimate/2009 estimate

Canadian County, OK /106,755 / 109,668
Cleveland County, OK /240,568 / 244,589
Grady County, OK /51,099 / 51,649
Lincoln County, OK /32,070 / 32,199
Logan County, OK /38,424 / 39,301
McClain County, OK /32,487 / 33,168
Oklahoma County, OK /706,116 / 716,704

Adding in Pottawattomie County's new population of 70,274, the OKC-Shawnee Combined Statistical Area is 1,297,552. So very close to passing 1.3 million! Some other figures here: RezoneOKC Blog Archive 2009 County/Metro Population Estimates