Well, hard to say if you're being played or not...you can only be the judge of that.
The 7600kms is not unreasonable for a car with in-service date of June 28/12. My own 135i has in service date of June 15 and I have about 5400kms on mine, BUT, I haven't done any trips with it, and we have another car. Also, I personally put every one of those 5400 kms on it.
The discount of close to 15% off MSRP, I assume, is OK. And the warranty is there, albeit only 3 and a half years left. But that's the price you pay for the discount.
What I would do is be prepared to wait, and order exactly what I want. It will be a 2013 model of course, and you likely won't get much if any discount. But you will own it from day 1, and if you plan on keeping it a while, that is worth something (at least to me it is).
No one can tell you what to do here, let your "guts" be your guide. Good luck.
2012 135i E82 MSport 6MT Jet Black
Previous BMWs - 2012 135i MSport LMB DCT(sold), 2011 X3 35i MSport VR (sold), 2009 M3 Sedan AW (sold), 2008 535xi MSport AW (sold), 2007 328xiT Barbera (sold), plus 11 others in the 70s & 80s.