What is the path used for the HD wallet in Bitcoin Core 0.13?
0.13 (current most recent release) supports HD wallets (if you create a new wallet with 0.13 it will use HD by default, &lt;0.13 wallets will keep the non HDness).

You can disable the HD feature in >=0.13 with -usehd=0 (or usehd=0 in bitcoin.conf).

It does use only hardened private key derivation.

The keypath-scheme is m/0'/0'/k'.

BIP44 is not supported right now. It makes little sense (weak security) to use public key derivation (BIP44 does) together with a possibility to export private keys.