Well considering the wealth of info we got in the last several previews, this one was definitely on the light side. But hey, at 3 previews a week, not everyone of them can be a gold mine of info.
I think the article mostly told us things we already knew, however, there were a couple of interesting tidbits:
1) Powers are obvious, and the person knows you did something to them. Does that mean no more stealth wizards casting spells on unsuspecting people? Or perhaps there are feats for that.
2) We now know how fire/cold spells work, etc. Actually those are quite useful because of the way vulnerabilities work. Since vulnerabilities just add more damage, having lots of energy types allows you to trigger them more often. On the other hand, more chance to meet some resistance as well.
3) We know more about implements. However, they didn't answer a very important question, one that has come up time and time again since the pregens were created:
Does a cleric have to wield (in his hand) his holy symbol to get the implement bonus, or does he just have to wear it?