I just preordered mine this morning (64gb black). $500 bucks upgrade on my second line so I don't lose unlimited data on my line. Then again, I can't jailbreak It when it comes in, so I can't tether anyway - talk about a catch 22.
I'll be testing it fully to see what works and what doesn't. I don't see why an extension that plugs into the snap in and converts the 30 pin to the 8pin lightning connector wouldn't work.
If anyone is looking for a factory unlocked Verizon 4S 64gb white, let me know!