Regarding slam: I'm not sure how it is on the beta, but for fury, this has what has been getting the best results for me:

Priorty BT->HS->RB-> if all are on CD and you have bloodsurge, then Slam above 20%

Priority below 20%: Execute, nothing else (more dps and dpr than all other warrior abilities, for me at least)

Slam isn't worth the rage cost at any point in the fight, for fury anyway. Also, the prot talent that makes your 2nd heroic strike an automatic crit does 2 things:

1. It devalues the level of crit (see: elemental shaman auto crit mechanic)
2. It devalues any other rage dump (see: slam, still hitting like a wet noodle), unless your other rage dumps hit way harder than HS (see: Execute, finally worth using below 20%, but possibly overpowered).

Frankly I don't care if slam is removed from the fury rotation; I think blizzard probably will buff it because why else have a talent to make it instant? Maybe a good way would be to have slam be free with bloodsurge proc (if they don't want to up the damage), because as it is right now, it seems dps would be better to just wait an extra second for HS to come off cooldown and hit that.

taking a look at some top 10 logs from saurfang, I see top fury warriors hitting slam about 2-5 times during the encounter (likely in the few times when BT, RB, and HS are all on CD), and not even close to using all of their Bloodsurge procs. They were all spamming execute under 20% too (13-18 executes), checked the logs on that, only Execute below 20% for the logs I viewed for some of the top 10 fury dps'ers on Saurfang.