Ok,
I created a wallet on Armory and I have a paper backup.
My question is:
1- I see web wallets that already implemented bip32 where an address that starts with (3) 3J5emZhKuLWyW292dFgDo1YhFN1MWVyV13 is created. Is it right that I can send bitcoins to this address and for each transaction will be created a new address that start with (1)?
2- When Armory implement bip32, will I need to create a new backup?
The addresses that start with "3" are P2SH addresses, usually used for multisig. Armory version 0.90 and previous did not support sending to these addreses, but the new version to be released soon (0.91) will allow it. It's up to them to deal with their own P2SH addresses, and how to create and spend from them. But Armory will keep using the ones that start with "1", such as creating change addresses that start with "1". Armory has no mechanism to spend multisig txOuts, even if it has some of the private keys.
As soon as this next version is out, my number one priority is finishing the new wallet design, which will suppot BIP32, multisig, P2SH, compressed keys, and a variety of other things. It will also allow you to migrate your existing wallet to the new format, and continue using your existing wallets. Though you won't get the benefits of the new BIP32 stuff.