Here's what I've been able to confirm so far:

Frenzied Regen does increase max health by 30% and it's duration has been increased to 20 seconds, but the healing per rage has been unchanged. 3% health per rage is a typo.

Feral Faerie Fire no longer costs rage in bear form.

Savage Roar does increase white damage only, by ~53% with the glyph.

Barkskin is still usable in forms, not sure yet if this will stack with the new Survival Instincts.

I am still benefiting from Predatory Instincts (+10% crit damage) despite it being removed ages ago; I may have to use a premade character if this a result of transferring over a character with the talent, since it's hard to say what other talents I may be benefiting from that I shouldn't be.

This is incorrect - all of our abilities except bleeds scale off of weapon damage, which is directly increased by the weapon dps of your currently equipped weapon. There does seem to be a bug, at least with the skull level training dummies (renamed Raider's Training Dummy), where you only crit or glance (with white attacks at least, didn't test yellows) and glance reduces your damage by an absurd amount, on the order of 80%.

My quick thoughts on the Savage Roar change: this is another instance of reducing the feral dps skill cap, but in a different way than Endless Carnage. That talent makes it easier to keep up the rotation, while the Savage Roar change doesn't make the rotation any easier to sustain but it does reduce the damage loss you suffer by letting it drop (Endless Carnage, while making the rotation easier to perform, actually makes you pay a larger damage loss for Rake downtime since it increases Rake's DPE).

I'll update the OP when I'm able to con a couple guildies into helping me confirm the other changes.

Is there any cooldown on that? That is a big change on current (I hope we are in the position to need it!)

That wouldnt make much sense. I understand why blizzard wants to make feral rotation easier, but that would make it ridiculously easy. Then again blizzard is known for overshoting nerfs and buffs.

Compared to our current rotation there would actually be 4 things making it easier if these energy costs were implimented.

A. Endless carnage talent
B. faster energy regenerating with haste
C. SR change (also makes it plausible that we might gear towards haste)
D. Supercheap skills

Especially when you consider the mix of cheaper skills and faster energy regeneration it would seem like playing feral in cata would be button mashing. It would also make beserk kinda mundane.

I strongly suggest not to draw any conclusions from the current state of the beta. Things keep changing a lot from one build to the next, and several class abilities (+all professions) are still only partially implemented and/or non-functional (improved feral charge was not working, last time I checked). The energy costs looks more like placeholders than anything else, thrown in just to allow players to test the content. I would be very surprised to see them remain at current values. From the changes one week to the next, I'd say that balancing on the classes has not even started, as confirmed by the fact that there are no class-specific beta forums.