Replacement iPhone 4S - will it have 5.0.1?

That depends on how much stock was left before the 5.1 rolled out. If they have a few, you may be lucky. If the ran out, then it's likely 5.1. Genius won't know what version it has inside and there is no way for them to tell until you open the box and activate and see what ios version it has.

I purchased a factory unlocked iphone two days ago and it had 5.0.1 already installed. But I updated to 5.1. Because I don't care about JB.

 

Notify the that you want the lower software but don't tell him why. My excuse is I'm a developer.

 

You might not be able to upgrade it to 5.0.1, especially if Apple stopped signing it. TU may have the SHSH blobs available for downgrading, but if Apple isn't signing it and only 5.1, you may only get that.

Besides, you may come to find out that with this replacement iPhone, you may be getting better battery life with 5.0 and insignificant battery life increase with 5.0.1.

but the first thing to find out is if Apple is still signing 5.0.1. If they aren't, your only option is to stay on 5.0 and jailbreak from there.

BL.

 

You can not, it's too late.
But even if you could you cannot use blobs to restore a 4S yet.
Only options are stay on 5.0 and jb or go to stock 5.1