The Beemers could spring a surprise, BMW do have a record of doing that over the recent years, however the last time they tried with a saloon it did not go quite so well!.
GT2 will be all about the Vettes I think.
I think the Lambo this year will be a much stronger contender, if its left to the JLOC it will be a shambles again, But VAG will be very keen to ensure that does not happen again and I suspect, if a car does turn up it will be a much better prepared car.