RCP has it at 46-46-8. The eight tossups at RCP are:
AK: Begich (D)
AR: Pryor (D)
CO: Udall (D)
GA: Open (R)
IA: Open (D)
KY: McConnell (R)
LA: Landrieu (D)
NC: Hagan (D)
538 has these as:
AK: really even
AR: slight R
CO: D
GA: R
IA: D (get this one Joni!)
KY: R
LA: slight R
NC: really even
So, unofficially, I see this as 50-48 R with two very close races in AK and NC. We have to avoid the disastrous gaffes of the R candidates of last time.
Kentucky is in play, IMO.