I think you usually get a refurbished device, but who knows what the service point will do if they don’t have refurbished at hand at that moment. Can you pick to have a brand new one? I don’t think so.
For example, if you buy a device very shortly after it is released, Apple just doesn't have any refurbished devices yet. Takes about two or three months. So for a very short time, you will get a new device. Which likely comes from a "refurbished" box.
Anyway, if your device is six months old, then whatever refurbished device you get will be in better condition than your six month old device.
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What if I get a refurbished iPad for my New iPad? But I have warranty until the end of this year And if I will have problem with a replacemrnt ipad I can bring back.
You have the exact same warranty as you had before. Say you bought an iPad on February 1st. You have warranty until February 1st next year (or maybe January 31st, not sure). If your replacement breaks before that, it is under warranty. If it breaks later, it's not under warranty, just like your original iPad wouldn't have been under warranty. (But I think all replacements have three months warranty, so in my example, if your iPad broke on January 28th, and for some reason it took until February 5th to get a replacement, that replacement would be under warranty until May 5th. )