On Tue, Mar 11, 2014 at 10:13 AM, Jeff Garzik <jgarzik@bitpay.com> wrote:

Sure, but I don't see wallets being able to _assume_ _remote_ parties
have an HD wallet for a long, long time. Interoperability common
sense implies the environment will be heterogenous, perhaps forever,
invalidating assume-each-party-uses-HD logic.

If the remote party is one of the parties involved in a multisig, and speaks the "Lets set up a multisig wallet together / Lets spend from a multisig" protocols, then it should be perfectly reasonable to assume that they're HD-capable.

Remote parties paying into a multisig, or receiving funds from a multisig, don't have to support it (that's what P2SH gives us).

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Gavin Andresen