BIP32 specifies hierarchical deterministic wallets, where a master seed fully determines a whole tree of keypairs that can be arbitrarily branched. It also introduces the notions of internal and external keypair chains that can be used independently to generate public or private keys.
Now I know that for example Armory uses deterministic wallets, but I cannot seem to find any implementation of the branching feature as described in BIP32. In particular, I want to generate a chain of linked addresses which are spendable using only one of the keys from my wallet as seed of a new branch (roughly the use case described in Recurrent business-to-business transactions).
Are there any other implementations of BIP 32 I am not aware of? Are there any plans to (fully) implement BIP 32 in Armory or any other client?