Bathurst is my favorite, so no question I'll be at that one.
They haven't said yet, but my guess is that it'll be the VRS Sprint Series cars...so basically every GT3 on the service, with the M4 in place of the Z4 (which is now legacy I believe).
My preference will likely be something mid engined because I think they are more balanced at Bathurst. We've run the Ferrari the last few years with some success, but the Lambo might be fun as it's new. Even though it's basically a shorter wheel base Audi it has some driving style differences.