I haven't seen this mentioned here, so I just want to note that the Savage Roar glyph simply increases the effect of Savage Roar by 5% (so, 5% more auto-attack damage). Testing showed that Savage Roar, glyphed or not, did not affect anything besides auto-attack damage (not even furious swipes).
Comparison of damage values from a raid on 10/8 (pre-patch) and 10/15 (post-patch and post several fixes) showed about 3/4 the previous damage values for non-bleeds. This is taken from a sample raid fight on a static target, and is consistent for auto-attack and shred (I didn't glyph feral bite, so I don't have useful post-patch data from that, and my mangle sample set was pretty small, although it was in the ballpark). This implies no change in base damage, as that would have come from the savage roar getting changed (as it used to increase all damage by 33%, when glyphed).
Speaking of savage roar, it's clearly a less important self-buff now, as it gives a 50% (or 55%, glyphed) increase to what is now around 20% of our damage, and I completely agree with putting rip uptime as more important than roar uptime. I also think it's no longer worthwhile to clip savage roar. I'm also wondering about swapping the roar glyph for tiger's fury glyph, although TF can be hard to use optimally.
Regarding rake clipping, you can clip rake - if you rake while your rake debuff is still up, it only preserves the last tick, so if it had more than 3 seconds left on it, you lost one or more ticks. I'm still working on getting this right (and finding an addon with a good timer display

).
And for thorns, it still does lots of damage (around 7k a hit), as the strength of it is updated as your ap/sp changes. So, while it may only say ~1k in the tooltip for caster form, it'll still do plenty after you shift form. At the moment, at least, it can be worth a fair bit of damage depending on how much the tank gets hit, so it's worthwhile to hit the tank with this right before combat starts.
I don't use the glyph of ferocious bite. If you compare the dpe of 3x shred + fb(35) vs 3x shred + fb(70), the dpe of the latter is much higher. Assuming you're not having combo point issues, that makes it the way to go, in my opinion.