I am sorry to say that I didn't take notes (I was on public transport), but here are a few points from the 40k broadcast on 8th edition that I was listening to just now.
* There is a rebate available if you've purchased a codex or rules book within the past 8 weeks (of the announcement of 8th).
* templates are gone.
* 40k will get some Age of Sigmar'ing -- there will certainly be annual generals handbooks.
* on release, there will be 5 (I think I heard that right) faction books available. There will be digital releases.
* all current units and models will be playable.
* don't stress about factions not being there on the 40k website at the moment -- they are still in.
* there are 14 odd force organization charts available. more bonuses available for themed armies (perhaps even not taking allies will generate more bonuses).
* each chart will generate different amounts of command points.
* command points purchase one-offs (re roll a die; activate your unit in close combat even if you would be going last due to being charged)
* 3 ways to play (see Age of Sigmar).
* TWO points systems: one for a very granular level (tournament play) and one for a broad brush stroke power level analysis (narrative play).
* the current death stars may be a thing of the past -- the ability to spread bonuses to units will only affect units with certain keywords associated with them (see Age of Sigmar!).
* no unit stat is capped at ten.
* no armour values for tanks! I guess they will have wounds greater than 10!
* sped up gameplay -- 1500 pts in about 1.5 hours.
* there has been plentiful playtesting and it is "very balanced".
Anyone remember anything else?