Browsed through the new DA codex today and took a look at the Combat Squad rules.
1. Certain DA squads (tac, dev, vet, scout) can only be bought as 5 or 10 man squads (3 or 6 for Bikes). Base cost for the initial five guys and then a set cost for the additional five guys.
2. If bought as 10 (or 6 for bikes), you can split them when you deploy them into two 5-man squads (3 for bikes). Both combat squads are deployed at the same time but may be deployed as far apart as you want.
3. Each combat squad becomes a scoring unit and is separate for VPs from the other combat squad. However, VPs for the squad are determined by halving the full squad cost, regardless of what weapons go where, etc. Their example was a 10 man squad with las/plas might cost 200 points, when split into two combat squads, each is worth 100 VP, even if one combat squad has both the big guns in it.
4. I didn't catch anything on how it handles a transport if one is bought for the squad, sorry.