Full article can be found here.
Clerics & Domains
Though I liked how 3rd Edition made it easier for clerics to be the heal-bot by swapping out spells for healing magic on a whim, I did not like how being Good required you to channel positive energy, while evil required negative energy (which made it harder to be an Evil cleric yet function "normally" in a group). In a similar vein, while I liked how 4th Edition made it easier to play a cleric that did more than funnel hit points into the fighter so that she could stay propped up, I did not like that all clerics could heal as a default choice.
Domains are pretty cool, though. Ideally I would like to see spell lists set entirely by gods and/or domains, so that not every cleric can necessarily heal, have ready access to healing, or heal in the same way; for example, clerics serving a god of war or protection might not be able to heal, but simply avoid or ignore damage (kind of like how some creatures can fight at negative hit points), while a cleric of death might be able to devour souls to heal herself and/or allies.
I do like that a cleric of war "gains proficiency in heavy armor and shields". I had been hoping that they would go the route of doling out other features on a case-by-case basis.
Now this I do not like. Basically if you have advantage from a bunch of sources, it still only takes one disadvantage to render them all obsolete. With a lack of conditional modifiers, I would prefer to have it where you stack them all up and whichever has the most "wins".
Tactical Combat Module
Predictably this sounds like a cluster of rules that adds 4th Edition's level of grid-oriented combat back into the game, though the mention of facing makes me think of 2nd Edition's Combat & Tactics book (I wonder if they will include rules for dueling and/or called-shots?). I am hoping that the rules make it very easy to turn this on and off, so that I can run free-form encounters and then switch over to a grid for something that I feel "deserves" it. I also hope that some of the individual portions are easy to strip out, so that I can disregard facing (or other rules) if it bogs down things too much.