I will just repeat what I just posted at the ED forum:
I still think the Intruder is the most likely candidate. Heatblur has repeatedly emphasized how they want to flesh out the surroundings for their modules. In the F-14 May Development Updated they said:
“We’re always been committed to ensuring that we launch of products with as much free, high quality content as we can. This includes e.g. campaigns and AI aircraft, ships and other assets.”
Just like they are developing an AI Draken for the Viggen, an AI Intruder is most likely as an addition to the Tomcat. The Intruder is simply needed as a strike aircraft to complement the air wing in the targeted time span. More so as the USS Ranger, one of the Forrestal-class carriers which HB invests much resources to develop, is featured in their planned Persian Gulf campaign. Ranger had the so called “All Grumman Air Wing”, which featured two Intruder squadrons and no other strike aircraft. That campaign will simply not work without Intruder. In addition an AI A-6E could be easily modified as KA-6D tanker and with some more effort into a EA-6B Prowler (both important assets to the Tomcat). I think this makes an AI Intruder very likely to happen.
Going from an AI A-6E and taking into account that the planned aircraft will have ground radar and multi crew, a full A-6E module just sounds most logical.
As it seems, Heatblur wants to build some sort of ecosystem (assets, maps) around the Viggen and the Tomcat. A Tornado would require them to create a 3rd ecosystem, which I find unlikely. I think it can be expected that future HB modules fit into the Sweden and US Navy environments that they are currently building up.