They will definitely offer you an extended warranty purchase (to extend the 4 year 50k mile WARRANTY). They will also likely offer you an extended MAINTENANCE aggreement. Most here would advise you not to purchase the MAINTENANCE agreement, since all that does is pre purchase maintenance items like oil changes etc. You can purchase those as you go for not much more, or go to a BMW indy dealer when your car runs out of the maintenance aggreement that it comes with.
For the WARRANTY aggreement, thats up to you to choose.... however most here would recommend that if you choose one, choose on that is FROM and BY BMW, regardless of how wonderful they tell you their third party warranty aggreement is. They may push their third party aggreement or not, but personally I would never buy a 3rd party warranty aggreement that was not BMW backed. A BMW backed one means you can go to any BMW dealer, anywhere. It will be more expensive than a third party warranty, but in general the BMW warranty covers more and is easier to get coverage on at a BMW dealer.
They might also offer you lojack car finding service (which most would decline) and they may offer you a package deal for all of these things together.
They will likely offer you a tire and wheel protection package, which will replace damaged wheels and tires... you have to damage a fair amount of wheels and tires for this to pay off, and it specifically does not cover "wear".
They also may offer you some sort of paint protection, or interior protection, or window etching, or some such like that. All of that should just be declined.
If you want my opinion, the only thing I would personally consider would be an extended WARRANTY, BMW backed only and discounted to whatever bottom line price they will do for it. There is no online resource that tells the pricing for these things.. and they will bring out a car that shows "list pricing" on the items that may or may not be the real list price. When they start going over the list of all the things they want to offer, I usually say something like :
"can you hang on a second? Before you go through the whole presentation of how wonderful all those things are, the only thing I might be interested in is the bottom line price for the BMW backed extended warranty... what are your best offers on that. I am not interested in any of the other items, thank you"
A good finance person will recognize that they should give you whatever price on the warranty is the best they can offer, and then you can decide if you want to get the warranty then or later. Remember you can always buy it later... as long as the warranty on your car has not expired (4 years 50k miles), you can purchase the warranty later for an upcharge (around 10 percent). So, you only will save 10 percent purchasing it at inception, and you may not love the car that much over the 4 years 50k it comes with to want to extend it. Thats why many will recommend not even purchasing the extended warranty at that time, but waiting for a couple years and making sure that its "the one" so to speak.
Good luck... dont forget to post a few picks when you pick it up.