Depends on whether you're talking e90 or e92. If you like the facelift coming out for the e90 then wait a lil bit. If not, then you better hurry up and place an order soon. You don't have to worry about the e92 refresh for a good while. No reason to wait.
Past: '08 E92 335i|JB|wheels|"eater of HPFPs"
Present:'15 Mustang GT|401A|PP|Recaros|6MT
Sig pic unrelated. I like to go sideways and stuff.