The approaches are in the AFCAD file. This one found here:
http://www.fsdreamteam.com/forum/index.php?topic=663.0Is the latest version. Just unzip and copy into the FSX\FSDreamTeam\OhareX\Scenery folder, overwriting any existing files with the same names.
This should give you instrumental procedures updated for the new runways. You can easily verify this by opening the default Microsoft GPS, select KORD, then look the available approaches. You should see 10/28 approach is there.
If you don't see 10/28 approaches in the GPS, maybe you have an AFCAD coming from another product (AI traffic package, perhaps ? ) that is based on default KORD runways/procedures, that is taking precedence over ours. Normally, if our KORD is on top of the scenery library, this shouldn't happen. However, it wouldn't hurt if you remove any addon AFCAD made for the default KORD that you might have around.
If you see the updated approaches in the GPS, but the ATC do not clears you to use it, try to put some wind in the correct direction, because FS ATC usually prefers the longest runway, *unless* the wind is too strong to use it. If you put an wind coming from 270 at about 20 knots, FS ATC should enable both 28 and 27R, and you should be able to request either approach from the ATC menu.
The FMC databases are a different issue: these are usually separate databases from the scenery, you need to be sure you don't have doubles, but this is something that you need to check yourself with the databases you are using and eventually with the utilities that comes with the airplane to handle the databases, when available.