I put together a small table and fought a battle using two Space Marine forces, mostly consisting of Marines and Land Raiders so I didn't have to worry about a lot of special rules, although I did include a few characters and a small titan. The simple story was that one force had turned traitor and the other had been dispatched to show them the error of their ways and flush them out of the city they had fortified.
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It is slightly disappointing that GW decided to focus on the Armageddon campaign and therefore focus on Imperial and Ork forces, as there has only been an Eldar list published in addition to the core rule lists (and two alternative Ork and Imperial Guard ones). That said, there are fan made lists for Tyranids and Squats, which I look forward to using.
I always liked this scale of game in the Warhammer 40K universe and look forward to painting and playing more battles using these rules. I had previously intended to use Dirtside 2 for 6mm, but they are back on the shelf for now...