I think Seat have said they're doing another Exeo but it will be more of a Seat product than a Audi hand-me-down not sure what to make of that - I can't see there was any great need to drop the Exeo because of some bit of legislation or not so they could have kept selling it until Audi were done with the B8 and taken that, I suspect it's replacement will be less well made.
Unfortunately the mid-saloon sector is a shrinking in favour of new sub-niches - personally and obviously I'm biased, but I don't know why there's not a sea of Exeos in every carpark up and down the land.
Audi fit and finish, which means there are very few, if any, cars you can buy with a better put together interior and it's handsome (to me) especially with the facelift grill and it's better in a lot of ways than the A4 it's based on.
Yes technically the chassis design is 10 year old now, so it's smaller than a lot of current cars in it's segment, but it's not old fashioned - the suspension design is newer and the drivetrain is current so you've got the advantage of a car that been through a few revisions and has NO KNOWN FAULTS.
And it's cheap too - a rebadged premium saloon with 'sporty' image, current level Technology and loads of kit for - LESS than a base spec Mondeo.