I haven’t been able to find any info on this.
Can someone speak to how we should be approaching using the new gyroscope in iphone 4? Will unity eventually be providing this? Do i need to write my own connection?
If so- whats the recommended way to reference data in objective C from unity ?
Unity hasn’t released an update for this. I assume it won’t be in Unity until Unity 3.0 at least.
As for creating a link between C-obj and Unity…well, someone else will need to help you with that 
Ahh ok… well what is the recommended way to write objective C and have unity access the variables or data ?
I’m not too experienced with merging Obj-C and Unity yet, but I think this
http://technology.blurst.com/a-cocoa-based-frontend-for-unity-iphone-applications/
will help you get started.