If it is a proper little skirmisher, rather than mini 40k, i'd be more up for that. But it depends on what it's bringing to the table.
Speculation elsewhere on the net reckons it will be similar to Warcry.
A lot of my scepticism is coming from not wanting to buy into yet another flurry of updates, changes and new things from GW. It's literally non stop with no breathing space.
Unless you're an Eldar or Nids player...