For Cup, the low downforce package will debut this week-end at Kentucky. The package consists of a reduction in spoiler height from 6" to 3.5", the reduction of splitter overhang from 2" to 1/4" and the reduction in the width of the radiator pan from 38" to 25". The net downforce reduction will approach 30%, and Kentucky already had one of the most worn out, oldest racing surfaces on the schedule. Look for some of these cars to look like they're driving on ice, since some of the teams have committed virtually no resources whatsoever to doing any testing with it.
Also for Cup, there's a new high drag package that will debut at Indy on the 26th of this month and then will also be used again later on at Michigan. The package consists of the current 2015 splitter / radiator pan combo, but includes a 9" tall spoiler with a special air trapping wicker along the top edge. The intent of this package is to introduce high speed, high drag pack racing like what is currently seen at Daytona and Talladega.
The Xfinity guys will get into the high drag action at Indy as well, getting a 2" tall extension on top of the existing 4" spoiler, and also getting a super speedway style lower rear valence (dropped an additional inch from 2" to 3") to trap air underneath the car.
If anyone has any questions about any of the stuff that's upcoming, then there's no better time than the present to ask. Otherwise, fingers crossed for a great show!