Heat only comes with interfaces if you are doing the trade in offer of an old interface to a new one (which gets you $1000 off), and only the HD IO's, not the Omni.
Heat does not come with any new purchases of HDX.
As mentioned, HDX, HD Native, and regular Protools 10 all come with the same stock plugins and virtual instruments, the list is on this page:
http://www.avid.com/us/products/pro-...Bundledplugins